reportedly
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B2 adverb /rɪˈpɔːtɪdli/

reportedly

据报道
Meaning
according to what is said or believed, although not confirmed
Example
The company has reportedly agreed to the new terms.
公司 reportedly 已同意新的条款。
B2 noun /ˈrɪk.ʃɔː/

Rickshaw

人力车
Meaning
a light two-wheeled passenger vehicle drawn by one or more people
Example
We took a rickshaw to reach the busy marketplace.
我们乘坐人力车前往繁忙的市场。
B2 noun /ˈriːteɪlər/

retailer

零售商
Meaning
a person or business that sells goods to consumers rather than to other businesses
Example
The retailer offers discounts on electronic products.
零售商提供电子产品的折扣。
B2 noun ˈrɛstɪŋ pleɪs

resting place

安息地
Meaning
A place where someone or something rests, especially a burial site.
Example
The resting place of the martyrs is near the river.
烈士的安息地靠近河流。
B2 noun /ˌriː.ɪnˈfɔːrs.mənt/

reinforcement

强化
Meaning
Strengthening or supporting something, especially behavior or learning.
Example
Positive reinforcement helps in learning.
积极的强化有助于学习。
B2 noun /ˈrɪdəl/

Riddle

谜语
Meaning
a question or statement intentionally phrased so as to require ingenuity in ascertaining its answer or meaning; a puzzle
Example
The ancient riddle stumped all the scholars for years.
古老的谜语让所有学者困扰了多年。
B2 noun, verb /rɪər/

rear

后面 / 抚养
Meaning
the back part of something; to bring up or raise children or animals
Example
The mother cat reared her kittens in a quiet corner.
母猫在安静的角落里抚养她的猫仔。
B2 noun /reɪdʒ/

rage

愤怒
Meaning
intense anger or fury
Example
She shouted in a fit of rage after hearing the news.
她听到消息后在愤怒中大喊。
B2 noun /ˈrɒbər/

robber

强盗
Meaning
a person who steals property from others, often using force or threat
Example
The robber was caught after a quick police chase.
经过警方的快速追捕,强盗被抓住了。
B2 verb /reɪl/

rail

抗议
Meaning
to complain or protest strongly about something
Example
He railed against the unfair decision.
他抗议不公平的决定。
B2 noun /rɪˈstrɪk.ʃən/

Restriction

限制; 限定; 控制
Meaning
a limiting condition or measure; the limitation or control of someone or something
Example
There are strict restrictions on smoking in public places.
在公共场所吸烟有严格的限制。
B2 adjective /raɪp/

Ripe

成熟的; 准备食用
Meaning
fully developed and ready to eat; mature; ready for action or use
Example
The bananas are ripe and ready to eat.
香蕉已经成熟,准备食用。
B2 noun /ˈreɪn.dʒər/

ranger

巡护员
Meaning
A person responsible for protecting and managing forests, parks, or natural areas.
Example
The park ranger guided the tourists through the forest trail.
公园巡护员带领游客走过森林小道。
B2 noun /rɪˈsiː.vər/

Receiver

接收器
Meaning
a person or thing that receives something; the part of a telephone containing the earpiece and mouthpiece
Example
She picked up the receiver to answer the phone call.
她拿起听筒接听电话。
B2 noun ˌreɪdɪˈeɪʃən

radiation

辐射
Meaning
The emission of energy as electromagnetic waves or as moving subatomic particles.
Example
Radiation from the sun can be harmful without protection.
太阳的辐射没有保护可能是有害的。
B2 noun rɪˈpʌb.lɪk

republic

共和国
Meaning
A state in which supreme power is held by the people and their elected representatives, with an elected or nominated president rather than a monarch.
Example
A republic is governed by representatives of the people.
共和国由人民的代表治理。
B2 verb /reɪn/

reign

统治
Meaning
to rule as a king or queen; to be dominant
Example
The queen reigned for over sixty years.
女王统治了超过六十年。
B2 noun/verb /rɪˈmɑːrk/

remark

评论
Meaning
something that is said; a comment
Example
She made a remark about the weather.
她对天气做了一个评论。
B2 noun /ˌrɛvəˈleɪʃən/

revelation

启示
Meaning
A surprising and previously unknown fact, especially one made known in a dramatic way.
Example
The book was full of shocking revelations about the politician.
这本书充满了对政治家的震惊启示。
B2 noun /ˈruːmər/

rumor

谣言
Meaning
a currently circulating story or report of uncertain or doubtful truth.
Example
There’s a rumor that the company will merge next year.
有传闻说公司明年将合并。
B2 verb /rɪˈteɪn/

retain

保持
Meaning
to keep possession of something
Example
The company decided to retain its experienced employees.
公司决定保留其经验丰富的员工。
B2 noun /ˈrɛzərvwɑːr/

reservoir

水库
Meaning
A large natural or artificial lake used as a source of water supply.
Example
The city built a new reservoir to ensure enough drinking water for its residents.
这座城市建造了一个新的水库,以确保为居民提供足够的饮用水。
B2 adjective /ˈræp.ɪd/

Rapid

快速的;迅速的;急速的;
Meaning
happening in a short time or at a fast pace
Example
The rapid growth of technology has changed our daily lives.
技术的快速增长改变了我们的日常生活。
B2 noun /ˈrɔɪəlti/

royalty

皇室成员 / 特许权使用费 (作者收入)
Meaning
Members of a royal family or payment made to the owner of a patent, copyright, or natural resource.
Example
The author receives a royalty for every book sold.
作者从每本卖出的书中获得特许权使用费。
B2 adjective /ˈrek.ləs/

Reckless

鲁莽的; 冒失的; 危险的;
Meaning
acting without thinking about consequences; careless; dangerous;
Example
His reckless driving caused a serious accident.
他的鲁莽驾驶导致了严重的事故。
B2 noun rɪˈzɪl.i.əns

resilience

韧性
Meaning
The ability to recover quickly from difficulties; toughness.
Example
Testing the resilience of wood is crucial.
测试木材的韧性是至关重要的。
B2 noun /rɪˈzembləns/

Resemblance

相似
Meaning
the state of being alike or similar; similarity in appearance or character
Example
There's a strong resemblance between the two sisters.
这两个姐妹之间有着强烈的相似性。
B2 verb /rɪˈsaɪt/

recite

背诵
Meaning
To say aloud something learned, especially poetry or text, from memory.
Example
The child recited a poem in front of the class.
孩子在班级前朗诵了一首诗。
B2 adjective ˌrev.əˈluː.ʃən.ər.i

revolutionary

革命性的
Meaning
Involving or causing a complete or dramatic change.
Example
Revolutionary ideas are reshaping the industry.
革命性的思想正在改变这个行业。
B2 verb /rɪˈstrɪkt/

restrict

限制
Meaning
To limit the size, amount, or range of something.
Example
The government decided to restrict the use of plastic bags.
政府决定限制塑料袋的使用。
B2 noun /rʌʃ/

Rush

匆忙; 急促
Meaning
a sudden quick movement toward something; a period of great activity or demand; hurry
Example
There was a rush to buy tickets for the concert.
为购买音乐会门票而匆忙。
B2 verb /rɪˈstreɪn/

restrain

抑制
Meaning
to hold back or control; to limit or restrict
Example
Please restrain your dog.
请控制你的狗。
B2 verb /rɪˈkʌvərɪŋ/

recovering

恢复
Meaning
the process of getting better after illness, loss, or difficulty
Example
She is still recovering from the flu.
她还在从流感中恢复。
B2 noun /ˈruːlɪŋ/

ruling

裁决
Meaning
an official decision made by a judge or authority.
Example
The court’s ruling favored the defendant.
法院的裁决对被告有利。
B2 noun /ˈroʊ.lɪŋ pɪn/

Rolling pin

擀面杖
Meaning
a cylindrical tool used for rolling out dough or pastry
Example
Roll the dough flat with a rolling pin.
用擀面杖把面团擀平。
B2 adjective /ˈruː.mi/

Roomy

宽敞的; 有很多空间的
Meaning
spacious; having a lot of room
Example
The apartment is very roomy with spacious bedrooms.
公寓非常宽敞,拥有宽大的卧室。
B2 verb /ˌriː.kənˈsɪd.ər/

reconsider

重新考虑
Meaning
to think about something again, especially to change a decision or opinion
Example
She decided to reconsider her decision about moving abroad.
她决定重新考虑她关于移居国外的决定。
B2 verb /ˌriː.kənˈstrʌkt/

reconstruct

重建
Meaning
to build or form something again after it has been damaged or destroyed
Example
The city was reconstructed after the earthquake.
这座城市在地震后重新建设。
B2 adjective /ˈrɒt.ən/

Rotten

腐烂的; 坏的
Meaning
decayed; spoiled; bad
Example
The apple is rotten and should be thrown away.
苹果已经腐烂了,应该扔掉。
B2 noun /ˈrem.ə.di/

Remedy

药物;治疗;补救办法
Meaning
a medicine or treatment for a disease; a solution to a problem
Example
This herbal remedy helps with headaches.
这种草药治疗有助于缓解头痛。
B2 noun /rɪˈsɛs/

recess

休息
Meaning
A short break from work or school; also a small space set back in a wall.
Example
The children played outside during recess.
孩子们在休息期间在外面玩耍。
B2 noun /rɪˈdʒɛkʃən/

rejection

拒绝
Meaning
the action of refusing or dismissing something or someone
Example
Her rejection of the offer surprised everyone.
她拒绝了这个提议,令所有人吃惊。
B2 noun /ˈraɪvəlri/

Rivalry

竞争; 对抗
Meaning
competition for the same objective or for superiority in the same field; the state of being rivals
Example
The rivalry between the two teams made the match exciting.
两个队伍之间的竞争使比赛变得非常刺激。
B2 adjective /rɪˈfaɪnd/

Refined

精致的; 纯净的
Meaning
elegant and cultured in appearance, manner, or taste; purified
Example
She has very refined taste in art and music.
她对艺术和音乐有非常精致的品味。
B2 verb /ˈrɛkən/

reckon

推测
Meaning
To think, believe, or expect something; to calculate or estimate.
Example
I reckon it will rain later today.
我猜今天稍后会下雨。
B2 adverb /rɪˈɡɑrdləs/

regardless

不管
Meaning
without paying attention to the current situation or condition
Example
She will go to the party regardless of the weather.
她将去派对,不管天气如何。
B2 adverb /ˈraɪtli/

Rightly

正确地; 适当地; 公正地
Meaning
correctly; properly; justly
Example
She rightly pointed out the mistakes in the report.
她正确地指出了报告中的错误。
B2 noun /ˈrɒbəɹi/

robbery

抢劫
Meaning
the crime of stealing from someone or somewhere using force or threat
Example
The police are investigating the robbery at the local store.
警方正在调查当地商店的抢劫事件。
B2 noun /rɒd/

rod

细长的棒子,尤其是金属或木制的
Meaning
a thin straight bar, especially of metal or wood
Example
He used an iron rod to support the structure.
他用铁棒支撑结构。
B2 verb /ˈraɪpən/

ripen

幸福
Meaning
to become or make something ready to eat or fully developed
Example
The bananas ripened quickly in the warm weather.
当她收到奖项时,她无法隐藏自己的幸福。
B2 noun /ˌriːprəˈdʌkʃən/

reproduction

繁殖, 再生产
Meaning
The process of producing offspring; the act of copying or duplicating.
Example
The textbook included a detailed diagram of human reproduction.
课本中包含了人类繁殖的详细图表。
B2 noun /rɪˈfjuː.zəl/

Refusal

拒绝; 拒绝接受
Meaning
the act of saying no to something or not accepting something
Example
His refusal to cooperate made the project more difficult.
他拒绝合作让项目变得更难。
B2 adjective /rɪˈnjuː.ə.bəl/

renewable

可再生
Meaning
Able to be renewed or replaced naturally; not depleted when used.
Example
Renewable resources minimize environmental damage.
可再生资源减少环境损害。
B2 noun ˌrɛvəˈluːʃən

revolution

革命
Meaning
A forcible overthrow of a government or social order, in favor of a new system.
Example
The story is set during the French Revolution.
故事发生在法国大革命期间。
B2 adjective /ˈreɪsɪst/

racist

种族主义者
Meaning
showing or feeling discrimination or prejudice against people of other races
Example
He was accused of making racist comments.
他被指控发表种族主义的评论。
B2 adjective /rɪˈzɪl.i.ənt/

resilient

韧性
Meaning
Able to withstand or recover quickly from difficult conditions.
Example
Resilient materials ensure durability.
韧性材料确保耐用性。
B2 noun /ˌrɛprɪzɛnˈteɪʃən/

representation

代表
Meaning
the action of speaking or acting on behalf of someone or something
Example
Her representation of the team was impeccable.
她对团队的代表非常出色。
B2 adjective ˌriːprəˈdʌktɪv

reproductive

繁殖的
Meaning
Relating to the reproduction of offspring.
Example
The reproductive cycle of pests can cause rapid infestations.
害虫的繁殖周期可能导致快速的感染。
B2 noun /reɪˈʒiːm/

regime

政权
Meaning
a system or form of government, often authoritarian
Example
The military regime controlled the country for decades.
军事政权控制了这个国家几十年。
B2 verb /reɪd/

raid

突袭
Meaning
to attack suddenly; to search and seize
Example
Police raid the illegal gambling house.
警方突袭非法赌博屋。
B2 verb /rɪˈnuː/

renew

Meaning
to make something new again or extend its period of validity
Example
I need to renew my passport before traveling.
B2 noun /ˈreɪʃoʊ/

ratio

比例
Meaning
a relationship between two numbers showing how many times the first number contains the second
Example
The ratio of boys to girls in the class is 2:1.
班级中男生和女生的比例是2:1。
B2 noun /ˈrest.ləs.nəs/

Restlessness

不安
Meaning
the inability to rest or relax as a result of anxiety or boredom
Example
His restlessness during the long meeting was obvious to everyone.
在长时间的会议中,他的不安对每个人都很明显。
B2 adjective /ˈruːθ.ləs/

Ruthless

无情的; 残忍的; 毫无怜悯的
Meaning
showing no pity or compassion; cruel; merciless
Example
The ruthless dictator showed no mercy to his enemies.
那个冷酷的独裁者对他的敌人毫不留情。
B2 noun /ˌreɡ.jʊˈlær.ɪ.ti/

Regularity

规律性
Meaning
the quality of being regular; occurring at fixed intervals or in a consistent pattern
Example
The regularity of his exercise routine helped him stay healthy.
他锻炼的规律性帮助他保持健康。
B2 verb /ˌriːjuˈnaɪt/

reunite

重聚
Meaning
to bring together again after separation
Example
The family was reunited after many years.
这个家庭在许多年后重新团聚。
B2 noun /ˈriːzənɪŋ/

reasoning

推理
Meaning
the process of thinking about something in a logical way in order to form a conclusion or judgment
Example
Her reasoning for leaving was clear and logical.
她离开的推理是清晰和合逻辑的。
B2 noun /'ræd.ɪʃ/

Radish

小萝卜
Meaning
a small pungent edible root vegetable with white or red skin
Example
The farmer harvested fresh radishes from the garden.
农民从花园里收获了新鲜的小萝卜。
B2 adjective /rɪˈzɪstənt/

resistant

抗性
Meaning
not affected by something; able to oppose or withstand
Example
This fabric is resistant to water and stains.
这块布料对水和污渍具有抗性。
B2 verb /ˌriːˈbɪld/

rebuild

重建
Meaning
to build something again after it has been damaged or destroyed
Example
The villagers worked together to rebuild the bridge after the flood.
村民们一起努力,在洪水后重建了桥梁。
B2 adverb /rɪˈmɑːrkəbli/

remarkably

引人注目地
Meaning
in a way that is worthy of attention or notice; surprisingly
Example
She did remarkably well in the competition.
她在比赛中表现得引人注目。
B2 noun /ˈrerəti/

Rarity

稀有的状态; 不常见或稀缺的东西
Meaning
the state of being rare; something that is uncommon or scarce
Example
The antique vase was a rarity worth thousands of dollars.
古董花瓶是一种稀有物品,价值数千美元。
B2 verb /ˈrɛnəˌveɪt/

renovate

翻新
Meaning
to restore something old to a good state or to improve it
Example
They decided to renovate the old house before moving in.
他们决定在搬进之前修复旧房子。
B2 verb rɪˈstɔːr

restore

恢复
Meaning
To bring back to a former or original state; to reinstate.
Example
Restoring the tradition of student politics is necessary.
恢复学生政治传统是必要的。
B2 noun /rɪˈbel.jən/

Rebellion

起义
Meaning
an act of armed resistance to an established government or leader
Example
The rebellion against the king lasted for three years.
反抗国王的起义持续了三年。
B2 noun ˌriːkənˈstrʌkʃn

reconstruction

重建
Meaning
The action or process of reconstructing or being reconstructed.
Example
The reconstruction project took years.
重建项目花了几年时间。
B2 verb /reɪp/

rape

强奸
Meaning
to force someone to have sexual intercourse without their consent
Example
The law strictly punishes those who commit rape.
法律严惩那些犯强奸罪的人。
B2 verb /rɪˈzaɪd/

reside

居住
Meaning
to live or dwell in a particular place
Example
They reside in a large house near the river.
他们住在河边的一座大房子里。
B2 adjective ˈræd.ɪ.kəl

radical

能够带来根本性变化,反对传统的信仰或系统
Meaning
Capable of bringing fundamental changes opposite to conventional beliefs or systems.
Example
The leader proposed radical economic reforms.
领导人提议进行激进的经济改革。
B2 noun /ˈroʊstɪd miːt/

Roasted meat

烤肉
Meaning
meat cooked by dry heat in an oven or over fire
Example
The roasted meat was perfectly seasoned and tender.
烤肉被完美地调味和变得嫩滑。
B2 adjective /ˌrez.ɪˈden.ʃəl/

residential

住宅
Meaning
Designed for people to live in.
Example
The institution was fully residential.
该机构是完全住宅性质的。
B2 verb /riːˈɔːrɡənaɪz/

reorganize

重新组织
Meaning
to arrange something again in a different way for greater efficiency or order
Example
The manager decided to reorganize the team structure.
经理决定重新组织团队结构。
B2 noun /ˈrɛlɪvəns/

relevance

相关性
Meaning
the quality or state of being closely connected or appropriate
Example
The relevance of the information was clear to everyone.
信息的相关性对每个人来说都很清楚。
B2 adjective /ˈroʊlɪŋ/

rolling

滚动
Meaning
moving in gentle undulations; moving forward by turning over and over
Example
They drove through the rolling hills of the countryside.
他们开车穿过乡村的滚动山丘。
B2 adverb /ˈred.ɪ.li/

Readily

乐意地; 容易地; 毫不犹豫
Meaning
willingly; easily; without hesitation
Example
She readily agreed to help with the project.
她乐意地同意帮助项目。
B2 noun /ræntʃ/

ranch

牧场
Meaning
a large farm where animals such as cattle or sheep are raised
Example
They own a huge cattle ranch in Texas.
他们在德克萨斯州拥有一个巨大的牧场。
B2 noun /rɪˈlʌk.təns/

Reluctance

不情愿; 犹豫
Meaning
unwillingness to do something; hesitation
Example
He showed reluctance to accept the job offer.
他表现出不情愿接受工作提议。
B2 noun, verb /ræmp/

ramp

坡道
Meaning
a sloping surface joining two different levels; as a verb, to increase or rise sharply
Example
The car drove up the ramp into the parking garage.
汽车驶上了停车场的坡道。
B2 verb /rɪˈkɔːl/

recall

回忆
Meaning
to bring (a memory, fact, or situation) back into one's mind
Example
I can't recall the last time we met.
我记不得我们上次见面是什么时候。
B2 noun /ˈraɪfəl/

Rifle

步枪
Meaning
a gun with a long barrel that is fired from the shoulder
Example
The soldier carried a rifle during the mission.
士兵在任务中携带着步枪。
B2 adjective /rɪˈmuːvəbəl/

removable

可拆卸的
Meaning
able to be removed or taken away
Example
This phone has a removable battery.
这款手机有一块可拆卸的电池。
B2 adjective /ˈrɪɡ.ər.əs/

rigorous

严格
Meaning
Extremely thorough and demanding in analysis or practice.
Example
A rigorous study plan helps students achieve better results.
严格的学习计划帮助学生取得更好的成绩。
B2 verb /ˈreɪn.dʒɪŋ/

ranging

波动
Meaning
Extending or varying between limits.
Example
The temperatures are ranging from 15 to 30 degrees this week.
本周气温在15到30度之间波动。
B2 adjective /rɪˈzɜːrvd/

Reserved

内向的; 保守的
Meaning
slow to reveal emotion or opinions; restrained in manner
Example
She is quite reserved and doesn't talk much in meetings.
她相当内向,在会议中很少讲话。
B2 adjective /ˈrʌn daʊn/

run-down

破旧的
Meaning
in a poor condition; worn out or neglected
Example
They live in a run-down house at the edge of town.
他们住在城市边缘的一座破旧的房子里。
B2 noun /red liːf/

Red leaf

红叶
Meaning
red-colored leafy vegetable; amaranth leaves used as greens
Example
Red leaf is rich in iron and is commonly eaten in Bengali households.
红叶富含铁,并且在孟加拉家庭中经常食用。
B2 noun /ˈreɪ.zɪnz/

Raisins

葡萄干
Meaning
dried grapes, often used in cooking and baking
Example
She added raisins to the oatmeal cookies for extra sweetness.
她在燕麦饼干中加入了葡萄干,以增加甜味。
B2 verb /ˈruːɪn/

ruin

毁灭
Meaning
to destroy or damage beyond repair; to spoil completely
Example
Heavy rain could ruin our picnic plans.
大雨可能会毁掉我们的野餐计划。
B2 noun /ˈrɛlɪvənsi/

relevancy

相关性
Meaning
the quality of being closely connected or appropriate
Example
The professor questioned the relevancy of the example to the topic.
教授质疑了这个例子与主题的相关性。
B2 verb /rɪˈkɜːr/

recur

Meaning
to happen again, especially repeatedly or at regular intervals
Example
The headache tends to recur every few weeks.
B2 adjective /ˈrɪdən/

ridden

充斥
Meaning
Full of or dominated by something unpleasant.
Example
The country was ridden with corruption.
这个国家充斥着腐败。
B2 noun rɪˈtɛnʃən

retention

保持
Meaning
The continued possession, use, or control of something
Example
The retention of information is essential for academic success.
信息的保持对学术成功至关重要。
B2 noun /roʊˈteɪʃən/

Rotation

旋转; 转动; 自转
Meaning
the action of rotating around an axis or center; a single turn
Example
The Earth's rotation takes 24 hours to complete.
地球的自转需要24小时才能完成。
B2 noun /ˈreb.əl/

Rebel

叛徒
Meaning
a person who resists authority or control
Example
The young rebel refused to follow the school rules.
那个年轻的叛徒拒绝遵守学校的规定。
B2 adjective /ˈræʃ.ən.əl/

Rational

理性; 合理; 逻辑
Meaning
based on reason and logic; sensible and practical
Example
She made a rational decision based on the available facts.
她根据可用的事实做出了理性的决定。
B2 noun /reɪk/

Rake

耙子
Meaning
a garden tool with a long handle and prongs for gathering leaves; to gather with a rake
Example
He used a rake to gather the fallen autumn leaves.
他用耙子收集掉落的秋天叶子。
B2 noun ˌrɛzɪɡˈneɪʃən

resignation

辞职
Meaning
The acceptance of something undesirable but inevitable; giving up.
Example
Her resignation from the position was unexpected.
她辞去了职位,这是出乎意料的。
B2 adjective /rɪˈflektɪv/

Reflective

反射的; 沉思的; 能反射光或图像
Meaning
thoughtful; contemplative; able to reflect light or images
Example
After the meeting, he was in a reflective mood.
会议后,他处于沉思的状态。
B2 noun /ˈraɪət/

Riot

骚乱; 暴乱
Meaning
a violent disturbance of the peace by a crowd; an uncontrolled outburst
Example
The peaceful protest turned into a riot when violence broke out.
和平抗议活动在暴力爆发时变成了骚乱。
B2 adjective /ˈrɪski/

risky

Meaning
Involving the possibility of danger, harm, or loss
Example
Investing in that startup is risky but could bring high rewards.
B2 verb /rɪˈfreʃ/

refresh

使清新
Meaning
to make fresh again; to restore energy
Example
A cold drink refreshes me on hot days.
冷饮在炎热的日子里让我感到清爽。
B2 noun, verb /ˈrætəl/

rattle

嘎啦作响;拨浪鼓
Meaning
to make a rapid series of short, sharp sounds; a device or object that makes such a sound
Example
The loose window began to rattle in the strong wind.
在强风中,松动的窗户嘎啦作响。
B2 noun ˌreɪ.di.oʊ.ækˈtɪv.ə.ti

radioactivity

放射性
Meaning
The emission of ionizing radiation or particles caused by the spontaneous disintegration of atomic nuclei.
Example
Radioactivity is used in medical treatments like cancer therapy.
放射性在包括癌症治疗在内的医疗治疗中被用于治疗。
B2 noun ˈruθləs ˌkɑmpəˈtɪʃən

ruthless competition

无情的竞争
Meaning
Fierce and merciless rivalry or contest, without pity or compassion.
Example
Ruthless competition for power leads to societal issues.
为了权力的无情竞争导致了社会问题。
B2 noun /ˌrɪəlɪˈzeɪʃən/

realization

实现
Meaning
the act of becoming fully aware of something as a fact
Example
Her realization of the problem helped solve the issue.
她对问题的实现帮助解决了问题。
B2 noun /rʌst/

Rust

铁锈
Meaning
reddish-brown coating formed on iron or steel by oxidation; corrosion
Example
The old car was covered in rust after years of neglect.
那辆旧车在多年忽视之后被铁锈覆盖。
B2 noun /rɪb/

Rib

肋骨
Meaning
one of the curved bones that protect the chest and lungs
Example
He broke his rib in the accident.
他在事故中断了一根肋骨。
B2 adverb /rɪˈspektɪvli/

Respectively

分别;按照给定的顺序;分开且按已经提到的顺序
Meaning
in the order given; separately and in the order already mentioned
Example
John and Mary are 25 and 30 years old respectively.
约翰和玛丽分别是25岁和30岁。
B2 verb /rɪˈzɛnt/

resent

怨恨
Meaning
to feel bitterness or displeasure about something or someone
Example
She began to resent the constant criticism from her boss.
她开始对老板的不断批评感到愤恨。
B2 adjective /ˈrest.ləs/

Restless

焦虑不安
Meaning
unable to rest or relax; constantly moving or fidgeting
Example
The child was restless during the long car journey.
孩子在长时间的车程中坐立不安。
B2 noun /ˈreɪsɪzəm/

racism

种族主义
Meaning
the belief that some races are superior to others, leading to unfair treatment or prejudice
Example
The organization works to eliminate racism in all forms.
该组织致力于消除所有形式的种族主义。