risk factor
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B2 noun rɪsk ˈfæktər

risk factor

风险因素
Meaning
Something that increases the likelihood of developing a disease or condition
Example
Water pollution is a significant risk factor for health.
水污染是健康的一个重要风险因素。
C2 verb /ˈrʌmpəl/

rumple

弄皱
Meaning
to make something untidy or wrinkled by creasing or crumpling
Example
She accidentally rumpled her dress while packing.
她在打包时不小心弄皱了她的裙子。
B1 noun /ˈreɪn.dɪər/

Reindeer

驯鹿
Meaning
a large deer with branched horns that lives in cold northern areas
Example
Santa's reindeer pulled his sleigh across the sky.
圣诞老人的驯鹿拉着他的雪橇穿越天空。
C2 verb /rɔɪl/

roil

搅动
Meaning
to make a liquid muddy or disturbed; to cause agitation or disorder
Example
The constant protests roiled the city streets.
持续的抗议活动搅动了城市的街道。
C2 adjective /rɪˈzɪstləs/

resistless

无法抗拒
Meaning
Impossible to resist; having an overpowering effect.
Example
She felt a resistless urge to laugh at the joke.
她感到无法抗拒的冲动，忍不住笑出声。
C1 verb /rɪˈtælieɪt/

retaliate

报复
Meaning
to make an attack in return for a similar attack
Example
The army retaliated after the enemy attack.
军队在敌人的攻击后进行了报复。
C1 adjective /rɪˈsɔːrs ɪˈfɪʃ.ənt/

resource-efficient

资源高效
Meaning
Using resources in a way that minimizes waste and maximizes productivity.
Example
Resource-efficient farming conserves water and energy.
资源高效的农业节约水和能源。
B2 noun, verb, adjective /ræŋk/

rank

职级
Meaning
A position in a hierarchy; to place in order according to importance or quality.
Example
She quickly rose to a senior rank in the company.
她迅速晋升为公司中的高级职位。
A1 noun ˈræbɪt

rabbit

兔子
Meaning
A small mammal with long ears, long hind legs, and a short tail
Example
The rabbit ran quickly into the forest.
兔子快速地跑进了森林。
C1 adjective /ˈraʊ.di/

Rowdy

吵闹的; 无序的; 破坏性的
Meaning
disorderly; unruly; noisy and disruptive
Example
The rowdy children were making too much noise.
吵闹的孩子们制造了太多噪音。
C1 noun /rɪˈvɜːrʒən/

reversion

逆转
Meaning
the act of returning to a previous state or condition
Example
The new policy marked a reversion to traditional methods.
新政策标志着回归传统方法。
C2 adjective /ˈrɪz.ə.bəl/

risible

可笑的
Meaning
so absurd or ridiculous that it deserves to be laughed at
Example
The idea of flying pigs is completely risible.
飞猪的想法完全是可笑的。
A2 noun /rɪˈleɪ.ʃən.ʃɪp/

Relationship

关系
Meaning
the way two people or groups feel and behave towards each other; a connection between two things
Example
They have a very close relationship.
他们有着非常亲密的关系。
A2 noun /ruːlz/

rules

规则
Meaning
explicit principles or regulations governing conduct or procedure within a particular area of activity
Example
The teacher reminded the students to follow the classroom rules.
老师提醒学生遵守课堂规则。
C1 adjective /ˌret.rəˈspek.tɪv/

Retrospective

回顾的
Meaning
looking back on or dealing with past events or situations
Example
The museum held a retrospective exhibition of the artist's work.
博物馆举办了这位艺术家的回顾展。
B1 noun /ˌrɛp.jʊˈteɪ.ʃən/

reputation

声誉, 名誉
Meaning
The opinion generally held about someone or something; fame or prestige.
Example
A good reputation is essential for business success.
良好的声誉对于商业成功至关重要。
C2 adjective /ˈrɛɡnənt/

regnant

在位
Meaning
Reigning; currently holding power, authority, or dominance.
Example
The regnant queen introduced several reforms during her reign.
在位的女王在她的统治期间进行了几项改革。
C2 noun /ˈrɛd.ə.ləns/

redolence

香气
Meaning
a pleasant smell or the quality of suggesting something strongly
Example
The redolence of jasmine filled the evening air.
茉莉花的香气充满了傍晚的空气。
A1 verb /riːd/

read

读
Meaning
to look at written words and understand their meaning
Example
I read books before going to bed.
我在睡觉前读书。
C2 noun /ˈrɛv.ər.i/

reverie

白日梦; 心神不定
Meaning
A state of being pleasantly lost in one's thoughts; a daydream.
Example
Lost in reverie, he didn't hear his name being called.
沉浸在白日梦中，他没有听到有人叫他的名字。
C1 noun /rɪˈteɪnər/

retainer

预付款 / 固定器
Meaning
a fee paid in advance to secure someone's services, or a device that holds something in place
Example
The lawyer asked for a retainer before taking the case.
律师在接案之前要求预付款。
A2 noun /ˈrʌnɪŋ/

running

跑步
Meaning
the action or sport of running
Example
Running every morning keeps me healthy.
每天早晨跑步保持我健康。
C1 noun /riːk/

Reek

有臭味; 给人强烈的不愉快或不想要的印象
Meaning
to have a very unpleasant smell; to give a strong impression of something unpleasant or undesirable
Example
The garbage can reeks of rotten food.
垃圾桶有腐烂食物的臭味。
B1 verb /rɪˈvaɪz/

revise

修改
Meaning
To change, improve, or update something, especially a written work.
Example
She had to revise her essay before submission.
她必须在提交之前修改她的论文。
C1 noun /rɪˈkɜr.əns/

Recurrence

复发
Meaning
the fact of something happening again; an instance of something happening again
Example
The doctor was concerned about the recurrence of the patient's symptoms.
医生对病人症状的复发感到担忧。
B1 noun rɔː mətɪˈrɪəlz

raw materials

原材料
Meaning
The basic material from which a product is made.
Example
The factory imports raw materials for production.
工厂进口原材料用于生产。
B2 noun /rɪˈmeɪnz/

remains

残留物
Meaning
the parts, pieces, or substances that are left after the rest has been used or removed
Example
The remains of the meal were left on the table.
餐后剩余的食物被留在桌上。
A2 verb /ˌrɛkəˈmɛnd/

recommend

推荐
Meaning
to suggest or advise something as being good or suitable
Example
I recommend trying the new restaurant downtown.
我推荐尝试市中心的新餐馆。
A2 adverb /ˈrɛə(r)li/

rarely

很少
Meaning
not often, infrequently
Example
She rarely eats sweets because of her diet.
她因为饮食限制，很少吃糖果。
C2 noun /ˌriːkruːˈdɛsəns/

recrudescence

复发
Meaning
a new outbreak or revival of something that had subsided, especially an undesirable condition
Example
Health officials warned of a recrudescence of measles in several districts.
卫生官员警告多个地区麻疹的复发。
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。
C1 noun /ˈræp.tʃər/

rapture

狂喜, 欣喜若狂
Meaning
A feeling of intense joy, delight, or ecstasy.
Example
She listened to the music in rapture.
她沉浸在音乐中，陶醉其中。
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。
B1 adjective, noun /ˈroʊmən/

roman

罗马的 / 古罗马公民
Meaning
relating to Rome or its people; a citizen of ancient Rome
Example
The Roman Empire influenced much of modern civilization.
罗马帝国影响了现代文明的许多方面。
C1 verb rɪˈlɪŋ.kwɪʃ

relinquish

放弃
Meaning
To give up any authority, responsibility, or property.
Example
He decided to relinquish his position as CEO.
他决定放弃CEO职位。
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。
C1 verb /rɪˈnaʊns/

renounce

放弃
Meaning
to formally declare rejection of something, such as a claim, belief, or way of life
Example
She renounced her citizenship to move abroad permanently.
她放弃了国籍以便永久定居国外。
B2 noun /ˈreɪtɪŋ/

rating

评分
Meaning
an evaluation or assessment, usually numerical
Example
The movie received a high rating from critics.
这部电影得到了评论家的高评分。
C1 noun /ˈrɒndɪvuː/

rendezvous

约会
Meaning
a meeting or appointment at an agreed time and place
Example
They arranged a secret rendezvous at the café.
他们在咖啡馆安排了一次秘密的会面。
C1 noun /rɪˈmɛmbrəns/

remembrance

纪念
Meaning
the act of remembering or honoring someone or something
Example
A service was held in remembrance of the fallen soldiers.
为阵亡士兵举行了纪念仪式。
C1 adjective /ræmˈbʌŋk.ʃəs/

rambunctious

喧闹的
Meaning
boisterous, energetic, and difficult to control.
Example
The rambunctious children filled the house with noise.
那些喧闹的孩子让屋子充满了噪音。
A2 verb /rɪˈmuːv/

remove

移除
Meaning
to take something away; to eliminate or delete
Example
Please remove your shoes before entering the house.
请在进入房屋之前脱下鞋子。
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 adjective /ˈrɪtʃ.u.əl/

Ritual

仪式
Meaning
relating to religious or ceremonial practices
Example
The wedding ceremony included many traditional ritual elements.
婚礼仪式包括许多传统的仪式元素。
A2 noun, verb /ˈriːzən/

reason

原因，理由
Meaning
A cause, explanation, or justification for an action or event; to think or argue logically.
Example
There is no reason to be upset.
没有理由生气。
A2 adverb /ˈriː.sənt.li/

Recently

最近
Meaning
in the recent past; not long ago
Example
I recently moved to a new apartment.
我最近搬到了一个新公寓。
C1 noun /rɪˈvɒl.vər/

Revolver

左轮手枪
Meaning
a pistol with revolving chambers enabling several shots to be fired without reloading
Example
The detective drew his revolver from its holster.
侦探从枪套中拔出了他的左轮手枪。
C1 adverb /ˈrɪdʒɪdli/

Rigidly

严格地; 不妥协地
Meaning
in a strict, inflexible manner; without compromise
Example
The rules are rigidly enforced in this institution.
这些规则在这个机构中被严格执行。
C1 adjective /rɪˈdʌn.dənt/

redundant

多余的
Meaning
Not or no longer needed or useful; superfluous.
Example
The report contained redundant information.
报告包含了多余的信息。
B2 verb /rɪˈkɜːr/

recur

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

Rumour

流言; 八卦; 新闻
Meaning
a currently circulating story or report of uncertain or doubtful truth; gossip
Example
There's a rumour that the company will close next month.
有传言说公司将在下个月关闭。
A2 noun /rɒk/

rock

岩石
Meaning
a large, solid piece of mineral matter
Example
The mountain was made of solid rock.
这座山是由坚固的岩石组成的。
B2 adjective /rɪˈfreʃ.ɪŋ/

Refreshing

清新
Meaning
making one feel energized and renewed; pleasantly new or different
Example
The cool breeze was refreshing after the hot day.
在炎热的日子之后，凉爽的微风让人感觉清新。
B1 noun /rɪˈspɒns/

Response

回应; 反应
Meaning
a reaction to something; an answer or reply; the way in which something reacts to external stimulus
Example
The government's response to the crisis was swift and decisive.
政府对危机的回应迅速而果断。
C1 verb /ˈreɪdieɪt/

radiate

辐射
Meaning
to emit energy or light; to spread out from a center
Example
The fireplace radiates warmth throughout the room.
壁炉向整个房间辐射热量。
A1 noun /ˈrɪv.ər/

River

河流
Meaning
a large natural stream of water flowing in a channel to the sea, a lake, or another river
Example
The river flows through the valley and into the ocean.
河流穿过山谷并流入大海。
C1 noun/verb /ˈrɛprɪˌmænd/

reprimand

Meaning
A formal expression of disapproval; to scold or criticize someone officially.
Example
The teacher reprimanded the student for being late.
C2 verb /rɪˈkænt/

recant

撤回
Meaning
to withdraw or renounce a statement or belief formally
Example
He recanted his previous statement in court.
他在法庭上撤回了之前的陈述。
C2 adjective /rɪˈfɛrəbəl/

referable

可参考的
Meaning
able to be related or directed to something
Example
The issue is referable to the new policy changes.
这个问题可以参考新的政策变化。
C1 noun /ˈrɛnɪˌɡeɪd/

renegade

叛徒
Meaning
a person who deserts or betrays an organization, country, or principles
Example
He was labeled a renegade after leaving the party and criticizing its policies.
他在离开党派并批评其政策后被贴上了叛徒的标签。
A2 verb /raɪz/

rise

上升
Meaning
to move upward; to get up from bed; to increase
Example
The sun rises in the east.
太阳从东方升起。
A1 adjective /ˈreɪ.di.əʊ/

radio

收音机
Meaning
Relating to radio waves or broadcasting.
Example
FAST is the largest radio telescope in the world.
FAST是世界上最大的射电望远镜。
C1 adjective /rɪˈsɜːrdʒənt/

resurgent

复兴的
Meaning
Becoming strong, active, or popular again.
Example
The resurgent economy gave hope to many businesses.
复兴的经济给许多企业带来了希望。
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。
C2 verb /rɪˈmɒnstreɪt/

remonstrate

抗议
Meaning
To make a forceful protest or objection.
Example
Citizens remonstrated against the new tax policy.
公民们抗议新税政策。
C1 adjective /ˈrænsɪd/

rancid

变质的
Meaning
having a bad taste or smell due to being old or spoiled (especially fats or oils)
Example
The butter had gone rancid after being left out too long.
黄油放得太久，变质了。
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。
C1 verb /ˈrɛplɪkeɪt/

replicate

复制
Meaning
to copy, reproduce, or duplicate something exactly
Example
The scientist tried to replicate the experiment for accuracy.
科学家尝试复制实验以确保准确性。
A2 verb /rɪŋ/

ring

铃声
Meaning
to make a clear sound like a bell; to call by telephone
Example
The bell rings every hour.
钟每小时响。
C2 noun /ˈræbəl/

Rabble

乌合之众
Meaning
a disorderly crowd; the common people regarded as socially inferior
Example
The politician dismissed the protesters as mere rabble.
政治家将抗议者视为仅仅是乌合之众。
B1 noun /ˈref.ər.əns/

Reference

参考资料
Meaning
the action of mentioning or alluding to something; a source of information
Example
Please provide references to support your research claims.
请提供参考资料以支持您的研究声明。
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 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。
C1 verb /ræsp/

rasp

Meaning
to speak in a rough, harsh voice or to scrape with a coarse sound
Example
He rasped out a warning before collapsing.
C1 verb /rɪˈkaʊnt/

recount

叙述
Meaning
to narrate or tell the details of an event or experience
Example
She recounted her adventures during the summer trip.
她讲述了她在夏季旅行中的冒险。
C2 adjective rɪˈtɛn.tɪv

retentive

记忆力强
Meaning
Having strong memory or the ability to retain information for a long time.
Example
Students with a retentive memory excel in academics.
记忆力强的学生在学术上表现优异。
C1 noun /ˌrɛspɪˈreɪʃən/

respiration

Meaning
The process of breathing or the exchange of gases in living organisms.
Example
Respiration is essential for all living beings.
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。
B1 noun rɪˈdʌk.ʃən

reduction

减少
Meaning
The action or fact of making a specified thing smaller or less in amount, degree, or size.
Example
Greenhouse gas reduction is a primary global goal.
减少温室气体排放是一个主要的全球目标。
B1 adjective /rɪˈlækst/

relaxed

放松的
Meaning
free from tension or stress; calm and comfortable
Example
She felt relaxed after listening to soft music.
听了轻音乐后，她感到很放松。
C2 adjective /rəˈʃɛrʃ/

recherche

稀有
Meaning
Rare, exotic, or obscure, often in a sophisticated or refined way.
Example
The gallery displayed many recherche artworks from unknown artists.
画廊展示了许多未知艺术家的稀有艺术作品。
C2 noun /ˈræpsədi/

rhapsody

激昂的歌曲/赞美
Meaning
an expression of great enthusiasm or an epic musical composition
Example
The singer’s performance was a rhapsody of emotions.
歌手的表演是一场情感的狂想曲。
C1 noun /rɪˈfaɪnəri/

refinery

炼油厂
Meaning
an industrial facility where raw materials are processed and purified
Example
The oil refinery processes thousands of barrels daily.
石油炼油厂每天处理数千桶石油。
C1 noun /riˈæktənt/

reactant

Meaning
A substance that takes part in and undergoes change during a chemical reaction.
Example
Oxygen is a reactant in the process of combustion.
C1 noun /ˈrɑːstər/

roster

名单
Meaning
A list or plan showing people’s duties or times when they are scheduled.
Example
The manager updated the staff roster for next week.
经理更新了下周的员工名单。
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。
C2 noun /rɪˈmɒnstrəns/

remonstrance

抗议
Meaning
A forceful protest or objection.
Example
The workers’ remonstrance against unfair treatment was ignored.
工人的抗议反对不公平待遇被忽视了。
C1 noun ˌriːˈstrʌk.tʃər.ɪŋ

restructuring

重组
Meaning
The action of organizing something differently.
Example
The company underwent restructuring to improve efficiency.
公司进行重组以提高效率。
C2 verb /rɪˈkwaɪt/

requite

回报
Meaning
to return or repay a favor, service, or feeling
Example
She requited his kindness with a thoughtful gift.
她用一份深思熟虑的礼物回报了他的善意。
B1 adjective /rɪˈkwaɪəd/

required

必要的
Meaning
necessary or compulsory
Example
A visa is required to enter the country.
进入该国需要签证。
B2 noun /ˈrʊki/

rookie

菜鸟
Meaning
a person who is new to an activity or organization; a beginner
Example
The rookie policeman made a few mistakes on his first day.
新警察在第一天犯了几次错误。
B1 noun /ˈrɛzɪdəns/

residence

住所
Meaning
a place where someone lives; a home or dwelling
Example
He recently moved to a new residence near the city center.
他最近搬到了市中心附近的一处新住所。
C2 noun /ræpˈskæliən/

rapscallion

顽皮的人
Meaning
A mischievous or cheeky person; a rascal.
Example
The little rapscallion hid his brother’s shoes as a prank.
这个小拉普斯卡里昂把他哥哥的鞋子藏起来，做了个恶作剧。
B1 noun rɪˈzɪs.təns

resistance

抵抗
Meaning
The refusal to accept or comply with something; the attempt to prevent something by action or argument.
Example
The resistance fought bravely against colonial forces.
抵抗力量勇敢地与殖民势力作斗争。
C1 noun /rɑk sɔlt/

Rock Salt

岩盐
Meaning
natural salt crystals formed from evaporated ancient seas; unrefined salt
Example
Rock salt is considered healthier than table salt.
岩盐被认为比食盐更健康。
B2 noun /ˈrɪə.lɪ.zəm/

realism

现实主义
Meaning
The quality of representing things as they are; a practical or factual view.
Example
Her paintings are admired for their realism.
她的画作因其现实主义而受到赞赏。
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。
C1 verb /ˈrʌm.ɪdʒ/

rummage

杂乱地翻找
Meaning
to search through something in a disorderly way
Example
He rummaged through the drawer for his keys.
他在抽屉里翻找钥匙。
B2 noun /raɪˈnɒs.ər.əs/

Rhinoceros

犀牛
Meaning
a large, heavy animal with thick skin and one or two horns on its nose
Example
The rhinoceros charged through the grassland.
犀牛冲过草原。
C1 noun /rɪˈtrækʃən/

retraction

撤回，撤回声明
Meaning
the act of taking back a statement, promise, or belief
Example
The newspaper issued a retraction of the false report.
报纸发布了对虚假报道的撤回。
C1 adjective /ˈrɪvɪtɪŋ/

riveting

引人入胜
Meaning
extremely interesting; holding the complete attention
Example
The movie was so riveting that nobody looked away.
这部电影如此引人入胜，以至于没有人移开视线。
C1 noun /ˈrʌmpəs/

Rumpus

喧闹; 骚动; 混乱
Meaning
a noisy disturbance; an uproar or commotion
Example
The children caused quite a rumpus in the playground.
孩子们在游乐场引起了相当大的骚乱。
B2 noun /ˈraɪvəl/

Rival

竞争对手; 对手;
Meaning
a person or thing competing with another for the same objective or for superiority in the same field
Example
The two companies have been business rivals for decades.
这两家公司已经是商业竞争对手几十年了。
B1 adjective rɪˈlaɪ.ə.bəl

reliable

可靠的
Meaning
Consistently good in quality or performance; able to be trusted.
Example
Reliable systems ensure efficiency.
可靠的系统确保效率。
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 /ˈrendər/

render

提供
Meaning
to provide or give; to make or cause to become
Example
The artist renders the scene beautifully.
艺术家美丽地渲染了场景。
A2 verb /roʊl/

roll

滚动
Meaning
to move by turning over and over on an axis
Example
She rolled the ball down the hill.
她把球滚下了山坡。
C1 noun /ˌrɛs.ɪˈprɒs.ɪ.ti/

reciprocity

为了共同利益与他人交换物品的做法
Meaning
The practice of exchanging things with others for mutual benefit.
Example
Business relationships thrive on reciprocity.
商业关系依赖于互惠。
B1 noun /reɪ/

ray

光线
Meaning
a narrow beam of light, heat, or radiation
Example
A ray of sunlight broke through the clouds.
一束阳光穿透了云层。
B1 verb rɪˈdjuːst

reduced

减少
Meaning
Make smaller or less in amount, degree, or size.
Example
Singapore has reduced plastic usage significantly.
新加坡大幅减少了塑料的使用。
C2 noun /rɪˈpæst/

repast

宴席
Meaning
A meal or the food eaten during a meal.
Example
They enjoyed a delicious repast by the riverside.
他们在河边享用了美味的宴席。
C1 noun/verb /rɪˈpriːv/

reprieve

Meaning
A temporary relief or delay from something unpleasant; to postpone or cancel punishment.
Example
The prisoner was granted a last-minute reprieve from execution.
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。
C2 noun /ˌrɛtroʊˈɡrɛʃən/

retrogression

倒退
Meaning
a return to a worse or less developed state
Example
The country experienced economic retrogression after the crisis.
该国在危机后经历了经济倒退。
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。
C1 noun /ˈroʊdənt/

rodent

啮齿动物
Meaning
a small mammal such as a mouse, rat, or squirrel, characterized by constantly growing incisors
Example
The farmer set traps to catch the rodents in his barn.
农民设置了陷阱，以捕捉谷仓中的啮齿动物。
C1 adjective /rɪˈtɜː.nə.bəl/

Returnable

可退还的
Meaning
able to be returned or given back
Example
The bottle is returnable for a deposit refund.
这瓶瓶子可以退还存款退款。
C1 noun ˈrez.ɪ.djuː

residue

残留物
Meaning
A small amount of something that remains after the main part has gone or been removed.
Example
Soap residue affects appliance efficiency.
肥皂残留物影响设备的效率。
B2 noun /rɪˈsɪp.i.ənt/

Recipient

接收者
Meaning
a person who receives something
Example
She was the recipient of the prestigious award.
她是这个著名奖项的接收者。
B1 noun /rɪˈfjuːz/

Refuse

垃圾; 拒绝
Meaning
waste material; garbage; to decline or reject something
Example
Please put the refuse in the designated bins.
请将垃圾放入指定的垃圾桶。
B1 noun /ˈrʌbɪʃ/

Rubbish

垃圾; 无用的东西; 胡说
Meaning
waste material; refuse or litter; nonsense or worthless things
Example
Please throw the rubbish in the bin.
请把垃圾丢进垃圾桶。