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B1 verb /spred/

spread

传播
Meaning
to extend over a larger area; to distribute; to apply
Example
The news spread quickly through the town.
新闻迅速在城镇传播。
B1 verb /ʃɪft/

shift

转移
Meaning
To move or change from one place, position, or situation to another.
Example
She had to shift her focus to the new project.
她不得不将注意力转向新项目。
B1 noun ˈsaɪləns

silence

沉默
Meaning
Complete absence of sound; quietness.
Example
Silence filled the air near the graves.
沉默充满了墓地附近的空气。
B1 verb, adjective /spɛnt/

spent

花费的, 精疲力竭的
Meaning
Past tense and past participle of 'spend'; also used as an adjective meaning exhausted or used up.
Example
She spent all her energy preparing for the exam.
她为考试花费了所有的精力。
B1 verb /swɪtʃ/

switch

切换
Meaning
to change from one thing to another; to exchange or replace
Example
I switched from coffee to tea.
我从咖啡转到茶。
B1 adjective /ˈsɪniər/

senior

高级
Meaning
having a higher rank or status; older or more experienced
Example
He is the senior manager in the department.
他是部门的高级经理。
B1 verb /səˈspɛkt/

suspect

怀疑
Meaning
to believe that someone has done something wrong; to doubt or mistrust
Example
I suspect he is lying about his whereabouts.
我怀疑他在谎报自己的下落。
B1 noun /ˈspeʃəlɪst/

Specialist

专家
Meaning
a person who has specialized knowledge or training in a particular area; an expert
Example
She consulted a heart specialist about her condition.
她就自己的情况咨询了一位心脏专家。
B1 noun /ˈsæm.ən/

salmon

鲑鱼
Meaning
A large fish with pink flesh, often eaten as food.
Example
They served grilled salmon for dinner.
他们晚餐时提供了烤鲑鱼。
B1 adverb /ˈʃɔːt.li/

Shortly

很快; 不久; 简短地
Meaning
soon; in a short time; briefly
Example
The meeting will begin shortly.
会议很快开始。
B1 adjective /ˌstreɪtˈfɔːwəd/

straightforward

直接
Meaning
easy to understand or do; simple
Example
Her explanation was straightforward and clear.
她的解释简洁明了。
B1 adjective /strɪkt/

Strict

严格；要求严格遵守规则
Meaning
demanding exact conformity to rules; severe; rigorous
Example
The teacher is very strict about homework deadlines.
老师对作业截止日期非常严格。
B1 noun /ˌsæt.ɪsˈfæk.ʃən/

Satisfaction

满足
Meaning
fulfillment of one's wishes, expectations, or needs
Example
She felt great satisfaction after completing the project.
她在完成项目后感到极大的满足。
B1 noun/adjective /ˈsmoʊ.kɪŋ/

smoking

吸烟
Meaning
The act of inhaling and exhaling the smoke of tobacco or other substances; wearing a tuxedo (adjective, formal context).
Example
Smoking is prohibited inside the building.
建筑物内禁止吸烟。
B1 noun /ˈsɛkrəteri/

secretary

Meaning
a person employed to handle correspondence and manage routine tasks for an individual or organization
Example
The secretary scheduled the meeting for tomorrow.
B1 noun /ˈsɛkʃən/

section

部分
Meaning
a distinct part or subdivision of something larger
Example
This section of the report needs further review.
报告的这一部分需要进一步审查。
B1 noun, verb /skiːm/

scheme

计划 / 阴谋
Meaning
a plan or arrangement, especially one that is secret or dishonest
Example
They devised a scheme to cheat investors.
他们制定了一个计划，欺骗投资者。
B1 adjective /səˈfɪʃənt/

Sufficient

足够的; 适合目的的; 满意的
Meaning
enough; adequate for the purpose; satisfactory
Example
We have sufficient time to complete the project.
我们有足够的时间来完成这个项目。
B1 noun /seɪnt/

Saint

被认为圣洁或道德的人；非常友善或有耐心的人
Meaning
person recognized as holy or virtuous; very kind or patient person
Example
Mother Teresa was declared a saint by the Catholic Church.
特雷莎修女被天主教教会宣布为圣人。
B1 adverb /ˈsædli/

sadly

悲伤地
Meaning
in a sorrowful or unhappy manner
Example
She sadly waved goodbye as the train departed.
火车开走时，她悲伤地挥手告别。
B1 verb /straɪk/

Strike

打击
Meaning
to hit forcefully; to stop work as a form of protest
Example
Lightning strikes the tall building during the storm.
雷电在暴风雨中打击高楼。
B1 noun /skriːn/

Screen

屏幕
Meaning
a flat surface on which pictures or words are shown; a movable partition used to divide a room
Example
The movie was displayed on a large screen in the theater.
电影在剧院的大屏幕上播放。
B1 verb /slɪp/

slip

滑倒
Meaning
to lose balance or fall while moving, or to accidentally slide from a position
Example
She slipped on the wet floor and fell.
她在湿滑的地板上滑倒了。
B1 adverb /spəˈsɪfɪkli/

specifically

特别地
Meaning
in a clear and exact way
Example
He was specifically asked to handle the finances.
他被特别要求处理财务。
B1 noun /ˌsaʊθˈwɛst/

southwest

西南
Meaning
the direction that is between south and west; a region in that direction
Example
They traveled to the southwest of the country for their vacation.
他们去国家的西南部度假。
B1 noun /swiːt pəˈteɪtoʊ/

Sweet potato

红薯
Meaning
A root vegetable with sweet flesh, typically orange or purple in color
Example
Roasted sweet potato makes a healthy and delicious side dish.
烤红薯是健康美味的配菜。
B1 adjective /ˈsætɪsfaɪd/

satisfied

满意
Meaning
Pleased or content with what has been achieved or received.
Example
He felt satisfied after finishing his project.
完成项目后，他感到满意。
B1 adjective /ˈsuːtəbl/

suitable

合适
Meaning
appropriate or right for a particular person, purpose, or situation
Example
This dress is suitable for the wedding.
这件裙子适合婚礼。
B1 noun /ˈsmoʊkər/

smoker

吸烟者
Meaning
A person who smokes tobacco or other substances
Example
He is a heavy smoker and tries to quit every year.
他是一个吸烟者，每年都试图戒烟。
B1 noun /ˈsæm.pəl/

Sample

样本
Meaning
a small part taken as an example of the whole; a specimen
Example
The doctor took a blood sample for testing.
医生取了一个血液样本进行测试。
B1 verb /spɔɪl/

spoil

破坏
Meaning
to damage or ruin something
Example
The rain spoiled the outdoor event.
雨水破坏了户外活动。
B1 noun /ˈsɛt ʌp/

set-up

设置
Meaning
The arrangement or organization of something; a planned structure or scheme
Example
The company presented a new set-up for the office layout.
公司为办公室布局提出了一个新的设定。
B1 adjective /sɪˈlek.tɪd/

selected

选定的
Meaning
carefully chosen from a group for a particular purpose
Example
He was one of the selected candidates for the scholarship.
他是获得奖学金的选定候选人之一。
B1 verb /ˈsætɪsfaɪ/

satisfy

满足
Meaning
to fulfill the desires, expectations, or needs of someone; to make content
Example
The delicious meal satisfied our hunger completely.
美味的食物完全满足了我们的饥饿。
B1 noun /ʃeɪm/

Shame

羞耻
Meaning
a painful feeling of humiliation or distress; something regrettable
Example
He felt deep shame for his dishonest behavior at work.
他因在工作中的不诚实行为感到深深的羞耻。
B1 noun /ˈsʌn.raɪz/

Sunrise

日出
Meaning
the time in the morning when the sun appears above the horizon
Example
We watched the beautiful sunrise from the mountain top.
我们从山顶观看了美丽的日出。
B1 adverb /sɪnˈsɪrli/

sincerely

真诚地
Meaning
with genuine feelings; honestly and truly
Example
I sincerely hope you recover soon.
我真诚地希望你早日康复。
B1 verb səˈpɔːrtɪŋ

supporting

支持
Meaning
Giving assistance to; helping to bear the weight of something.
Example
Supporting education initiatives helps reduce child labour.
支持教育倡议有助于减少童工。
B1 verb/adjective /sɪˈkjʊər/

secure

确保
Meaning
to make safe or protect; to fix something firmly in place
Example
Please secure the door before you leave.
请在离开前确保门锁好。
B1 noun /ˈsʌn.flaʊər/

Sun flower

向日葵
Meaning
a large yellow flower that turns to face the sun
Example
The sunflower field looked amazing in the bright sunlight.
向日葵田在明亮的阳光下看起来很美。
B1 adjective /ˈsɒlɪd/

solid

坚固
Meaning
firm and stable in shape; not liquid or fluid
Example
The ground was solid underfoot.
地面在脚下是坚固的。
B1 noun /ˈsʌb.stəns/

Substance

物质
Meaning
a particular kind of matter with uniform properties; the essential nature of something; material or content
Example
The scientist analyzed the unknown substance in the laboratory.
科学家在实验室分析了未知物质。
B1 noun /soʊl/

Soul

灵魂
Meaning
the spiritual or immaterial essence of a human being or animal; a person's emotional or intellectual nature
Example
She poured her heart and soul into her artwork.
她将自己的心和灵魂投入到艺术创作中。
B1 noun /ˈsʌməri/

summary

总结
Meaning
A brief statement of the main points of something.
Example
She wrote a summary of the book for her class.
她为她的课堂写了一份书籍总结。
B1 verb /səˈraʊnd/

surround

围绕
Meaning
To be all around someone or something.
Example
Mountains surround the small village.
山脉围绕着小村庄。
B1 adjective /ˈsɔːlti/

Salty

咸的
Meaning
having the taste of salt; containing salt; tasting of seawater
Example
The salty ocean water made her thirsty.
咸海水让她口渴。
B1 noun səˈluː.ʃənz

solutions

解决方案
Meaning
A means of solving a problem or dealing with a difficult situation.
Example
Biotechnology provides solutions to environmental challenges.
生物技术为环境问题提供解决方案。
B1 adjective /slaɪt/

Slight

轻微的; 细微的; 苗条的; 微妙的
Meaning
small in degree; not severe or intense; slim; thin
Example
There was a slight delay in the train schedule.
火车时刻表有轻微的延迟。
B1 adjective /ˈspaɪ.si/

Spicy

辛辣
Meaning
having a strong, hot flavor from spices; containing spices
Example
This curry is too spicy for me to eat.
这道咖喱对我来说太辣了。
B1 noun /swɒn/

Swan

天鹅
Meaning
a large waterbird with a long curved neck and usually white plumage
Example
The elegant swan glided silently across the water.
那只优雅的天鹅静静地滑过水面。
B1 adverb /ˈsel.dəm/

Seldom

很少
Meaning
not often; rarely; infrequently
Example
She seldom goes to the cinema.
她很少去电影院。
B1 noun /swet/

Sweat

汗水
Meaning
moisture exuded through the pores of the skin, typically as a reaction to heat, physical exertion, fever, or fear
Example
After running for an hour, he was covered in sweat.
跑了一小时后，他浑身是汗。
B1 noun /ˈsɜr.fɪs/

Surface

表面; 上层
Meaning
the outside part or uppermost layer of something
Example
The submarine emerged to the surface of the ocean.
潜水艇浮出海面。
B1 noun /stoʊv/

Stove

炉子
Meaning
a kitchen appliance used for cooking food by applying heat
Example
She cooked dinner on the gas stove.
她在煤气炉上做晚餐。
B1 adjective /spəˈsɪfɪk/

specific

具体的
Meaning
Clearly defined or identified; particular; exact.
Example
Make a specific plan to beat procrastination.
制定一个具体的计划以克服拖延。
B1 verb /ˈsɪzər/

scissor

用剪刀剪
Meaning
to cut with or as if with scissors
Example
The tailor scissored the fabric neatly.
裁缝整齐地剪了布料。
B1 noun /ˈspæroʊ/

Sparrow

麻雀
Meaning
small brown and grey bird commonly found in cities and towns
Example
The sparrow chirped cheerfully from the tree branch.
麻雀愉快地从树枝上啁啾。
B1 noun /stæf/

staff

员工
Meaning
a group of employees working together in an organization
Example
The staff at the hospital are very helpful.
医院的员工非常有帮助。
B1 adverb /ˈspeʃ.əl.i/

Specially

特别
Meaning
for a particular purpose; especially; specifically
Example
This gift was specially made for you.
这个礼物是特别为你做的。
B1 noun /sɔɪl/

soil

土壤
Meaning
The upper layer of earth in which plants grow.
Example
The soil in this area is reddish.
这个区域的土壤是红色的。
B1 noun /ʃrɪmp/

Shrimp

虾
Meaning
a small marine crustacean with a slender body and long legs
Example
We ordered grilled shrimp with garlic butter for dinner.
我们点了蒜蓉黄油烤虾做晚餐。
B1 noun /seɪlz/

sales

Meaning
activities related to selling products or services
Example
The company saw a significant increase in sales during the holiday season.
B1 verb /siːk/

seek

寻找
Meaning
to try to find or obtain something; to attempt or desire to achieve
Example
He decided to seek advice from his mentor.
他决定向他的导师寻求建议。
B1 noun /ˈspɪn.ɪtʃ/

Spinach

菠菜
Meaning
a vegetable with large dark green leaves that are eaten cooked or uncooked
Example
Fresh spinach is very nutritious.
新鲜的菠菜非常有营养。
B1 adjective /ˈskɪlfʊl/

Skilful

熟练的; 能手; 专家
Meaning
having or showing skill; expert and accomplished
Example
The skilful surgeon performed the operation with great precision.
熟练的外科医生以极高的精确度完成了手术。
B1 noun /sʌm/

sum

和
Meaning
the total amount resulting from the addition of two or more numbers or items
Example
The sum of 8 and 12 is 20.
8和12的和是20。
B1 noun /ʃɒk/

shock

震惊
Meaning
a sudden upsetting or surprising event or experience
Example
The news of his sudden departure was a shock to everyone.
他的突然离开消息让每个人都震惊。
B1 noun /ˈʃæd.oʊ/

Shadow

阴影
Meaning
a dark area where light is blocked by something; a person's silhouette
Example
The tree cast a long shadow across the garden in the evening.
树在傍晚把一个长长的阴影投射到花园里。
B1 verb /ʃaʊt/

shout

喊叫
Meaning
to say something very loudly
Example
He shouted at the top of his lungs to get their attention.
他尽可能大声地喊叫，以引起他们的注意。
B1 noun /ˈseɪ.ɪŋ/

Saying

谚语
Meaning
a well-known phrase that expresses something true about life; a proverb
Example
There's an old saying that practice makes perfect.
有一句老话说，实践出真知。
B1 noun, verb /stɒk/

stock

库存
Meaning
a supply of goods kept for sale or use; to keep or fill with goods
Example
The shop stocks a wide variety of products.
商店储存大量的商品。
B1 noun /ˈsʌn.laɪt/

sunlight

阳光
Meaning
Direct light from the sun.
Example
Sunlight does not reach the abyssal depths of the ocean.
阳光无法到达海洋的深渊。
B1 noun, verb /strɪŋ/

string

线
Meaning
a thin piece of cord or thread; to tie or fasten with a string
Example
She tied the package with a string.
她用一根线绑了包裹。
B1 verb /skɪp/

skip

跳过
Meaning
to omit or pass over something; to move lightly or quickly
Example
He decided to skip breakfast and go straight to work.
他决定跳过早餐，直接去上班。
B1 noun/adjective /ˈstændɪŋ/

standing

地位 / 声誉
Meaning
status, reputation, or position; also the act of being upright on the feet
Example
He has high standing in the community for his charity work.
由于他的慈善工作，他在社区中有很高的声誉。
B1 noun /ˈstʌmək eɪk/

stomach ache

胃痛
Meaning
Pain in the stomach or abdominal area
Example
I have a stomach ache after eating too much.
我吃得太多后感到胃痛。
B1 adverb /sɪɡˈnɪfɪkəntli/

significantly

显著
Meaning
in a way that is large or important enough to have an effect
Example
The economy has significantly improved over the last decade.
过去十年中，经济显著改善。
B1 verb /sɪˈlekt/

select

选择
Meaning
to choose from a number of alternatives; to pick out
Example
Please select your favorite color.
请选择您喜欢的颜色。
B1 noun ˈseʃən

session

会议
Meaning
A meeting of an official body, especially a legislature, council, or court of law, to conduct its business.
Example
The session was held on February 25.
会议于2月25日举行。
B1 noun /ˈsteɪtəs/

status

状态
Meaning
the social or professional position or condition of someone or something
Example
His social status improved after the promotion.
他的社会地位在晋升后得到了改善。
B1 verb /stretʃ/

stretch

拉伸
Meaning
to extend or expand; to make or become longer or wider
Example
Athletes stretch their muscles before exercising.
运动员在锻炼前拉伸他们的肌肉。
B1 noun, verb /spoʊk/

spoke

辐条 / 说
Meaning
As a noun, a bar connecting the center of a wheel to its rim; as the past tense of 'speak'.
Example
The bicycle's spoke was bent after the accident.
自行车的辐条在事故后弯曲了。
B1 adjective /ˈsplendɪd/

Splendid

壮丽的; 极好的; 印象深刻的
Meaning
magnificent; excellent; very impressive
Example
The castle looked splendid in the sunset.
城堡在日落时看起来很壮丽。
B1 adverb /səkˈsɛsfəli/

successfully

成功地
Meaning
in a way that achieves a desired result
Example
She passed the exam successfully after weeks of studying.
她经过数周的学习后成功通过了考试。
B1 verb /seɪl/

sail

扬帆旅行
Meaning
to travel on water in a boat or ship using sails or by wind power
Example
They sailed across the Atlantic Ocean last summer.
他们去年夏天横渡了大西洋。
B1 adverb /səˈpraɪzɪŋli/

surprisingly

令人惊讶地
Meaning
in a way that causes surprise or amazement
Example
Surprisingly, she finished the entire project in just one day.
令人惊讶的是，她在一天之内完成了整个项目。
B1 noun /ˈspiːʃiːz/

Species

物种; 类型
Meaning
a group of living organisms that can reproduce with each other; a type or kind
Example
The Amazon rainforest is home to thousands of animal species.
亚马逊雨林是成千上万动物物种的家园。
B1 noun /sɔːrs/

Source

源头; 来源
Meaning
a place, person, or thing from which something originates; the origin of information
Example
The river's source is high in the mountains.
这条河的源头位于群山之中。
B1 noun /slaɪs/

Slice

切片; 薄片
Meaning
a thin, flat piece cut from something larger
Example
Would you like a slice of pizza?
你想要一片披萨吗?
B1 noun ˈseɪ.vɪŋ

saving

储蓄
Meaning
The practice of keeping and accumulating money for future use rather than spending it immediately.
Example
Regular saving habits ensure financial security.
定期的储蓄习惯确保财务安全。
B1 verb /sɪŋk/

sink

沉没
Meaning
to go down below the surface; to descend
Example
The ship sinks in the deep ocean.
船沉入深海。
B1 verb /siːl/

seal

封闭，密封
Meaning
to close or secure something tightly or officially confirm something
Example
He sealed the envelope before sending the letter.
他在寄信之前封住了信封。
B1 noun /ˈsɛtɪŋ/

setting

背景
Meaning
the environment or place where something happens
Example
The setting of the movie was a beautiful beach.
电影的背景是一个美丽的海滩。
B1 noun /ʃel/

Shell

壳
Meaning
hard outer covering of an animal; explosive projectile for a gun
Example
The artillery fired a shell at the enemy position.
炮兵向敌方阵地发射了一个炮弹。
B1 noun ˈsɛʃənz

sessions

会议, 会议期, 时段
Meaning
A meeting of an official body, especially a court of law, to conduct its business; a period devoted to a particular activity.
Example
The sessions lasted for three hours.
会议持续了三个小时。
B1 noun /stiːl/

steel

钢铁
Meaning
a strong, hard metal made of iron and carbon
Example
The building was made from steel to ensure its durability.
建筑物是用钢铁建造的，以确保其耐久性。
B1 adjective /skɪld/

Skilled

熟练
Meaning
having or showing the knowledge, ability, or training to perform certain activities or work well
Example
He is a skilled carpenter who can build beautiful furniture.
他是一位熟练的木匠，能做出美丽的家具。
B1 verb /splɪt/

split

分割
Meaning
to divide or separate into parts or groups
Example
He split the log in two with an axe.
他用斧子把木头劈成两半。
B1 noun /səˈdʒes.tʃən/

Suggestion

建议; 建议
Meaning
an idea or plan put forward for consideration; advice or recommendation
Example
Do you have any suggestions for improving our team's productivity?
你有什么建议可以提高我们团队的生产力吗？
B1 noun /ˌsaʊθˈiːst/

southeast

东南
Meaning
the direction that is between south and east; a region in that direction
Example
The city is located in the southeast of the country.
这座城市位于该国的东南部。
B1 noun /ˈʃoʊldər/

Shoulder

肩膀
Meaning
the part of the body between the neck and the arm
Example
He carried the bag over his shoulder.
他把包拿在肩膀上。
B1 noun /ˈsɜːvənt/

servant

仆人
Meaning
a person who performs duties for others, especially in a household
Example
The servant opened the door for the guests.
仆人为客人开门。
B1 noun /ˈsaɪdˌwɔːk/

sidewalk

人行道
Meaning
a paved path for pedestrians at the side of a street.
Example
Children were playing on the sidewalk.
孩子们在路边的人行道上玩耍。
B1 noun /ˈsæl.ər.i/

Salary

薪水
Meaning
a fixed regular payment, typically paid on a monthly basis
Example
She receives a good salary for her work as a teacher.
她作为教师的工作，得到了很好的薪水。
B1 noun /sleɪv/

slave

奴隶
Meaning
a person who is the legal property of another and is forced to work for them
Example
The abolitionist movement fought for the rights of slaves.
废奴主义者运动为奴隶的权利而奋斗。
B1 noun /ˈsʌb.mə.riːn/

Sub-marine

潜艇
Meaning
a warship with a streamlined hull designed to operate completely submerged in the sea
Example
The submarine dived deep into the ocean to avoid detection.
潜水艇潜入海洋深处以避免被发现。
B1 noun /ˈʃed.juːl/

Schedule

日程安排; 计划;
Meaning
a plan that lists things or events and the times when they will happen; timetable
Example
Please check your schedule before confirming the meeting time.
请在确认会议时间前查看您的时间表。
B1 verb /stæmp/

stamp

Meaning
To bring down (one's foot) heavily on the ground; to imprint a mark or seal.
Example
She stamped her foot in frustration.
B1 noun ˈstrʌk.tʃər

structure

结构
Meaning
The arrangement of and relations between the parts or elements of something complex.
Example
The structure is designed for safety and functionality.
该结构是为安全和功能性设计的。
B1 noun /ˈsiː.hɔːrs/

Sea-horse

海马
Meaning
a small marine fish with segmented bony armor, an upright posture, and a curled prehensile tail
Example
The seahorse gracefully floated among the coral reefs.
海马在珊瑚礁间优雅地漂浮。
B1 verb /stɛə/

stare

盯着
Meaning
to look at something with a fixed gaze
Example
She stared at the painting for hours.
她盯着画看了几个小时。
B1 noun ˈsɪs.təmz

systems

系统
Meaning
A set of connected things or parts forming a complex whole.
Example
Effective systems improve productivity.
有效的系统提高了生产力。
B1 adjective /səˈpəʊzd/

supposed

假定的
Meaning
generally believed or assumed, but not necessarily true
Example
This is the supposed solution to the problem.
这是问题的假定解决方案。
B1 noun/verb /skeɪl/

scale

刻度 / 调整大小
Meaning
A system of ordered marks used for measurement; also means to climb or to adjust in size.
Example
The company plans to scale its operations globally.
公司计划全球扩展其业务。
B1 verb /spaɪ/

spy

间谍
Meaning
to secretly collect information about a person, group, or country
Example
He was caught spying on his neighbor through the window.
他在窗户旁边偷偷地监视邻居时被抓住了。
B1 noun /ˈswɛtʃɜːrt/

sweatshirt

运动衫
Meaning
A casual, long-sleeved pullover garment, typically made of cotton or fleece, worn for warmth or comfort.
Example
He wore a grey sweatshirt while jogging in the park.
他在公园慢跑时穿着灰色的斯威特衫。
B1 adjective /ˈsʌm.wʌt/

Somewhat

有点; 稍微; 适度
Meaning
to some extent; rather; moderately
Example
The movie was somewhat interesting but not great.
这部电影有点有趣，但不太棒。
B1 noun /ˈsoʊ.lər ˌsɪs.təm/

Solar system

太阳系
Meaning
the sun and all the planets, moons, asteroids and other objects that orbit around it
Example
Our solar system has eight planets orbiting the sun.
我们的太阳系有八个行星围绕太阳旋转。
B1 noun ˈstrʌɡ.əl

struggle

斗争
Meaning
A forceful or violent effort to get free of restraint or resist attack; a determined effort under difficult circumstances.
Example
The struggle for independence united the nation.
独立斗争使国家团结。
B1 adjective /ˈsekənderi/

secondary

次要的
Meaning
Less important than something else; derived from or dependent on something primary.
Example
Safety is our primary concern, while speed is only secondary.
安全是我们的主要关注，而速度只是次要的。
B1 noun /ˈsɪɡ.nəl/

Signal

信号
Meaning
a gesture, action, or sound that conveys information or instruction
Example
The traffic signal turned red, so we stopped.
交通信号灯变红了，我们停了下来。