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IELTS BNC: 376 COCA: 888
mainadjective [ before noun ]uk/meɪn/ us/meɪn/

B1 larger, more important, or having more influence than others of the same type主要的；最重要的；最大的

The main thing is not to worry.最重要的是不要担心。
One of the main reasons I came to England was to study the language.我到英格兰的主要原因之一是学习语言。
You'll find the main points of my proposal in the report.你们可以在这份报告中看到我计划的要点。
Our main aim/objective is to improve the company's productivity.我们的主要目的是提高公司的生产力。
The main problem is a lack of resources.主要问题是缺少资金。
My main concern about moving to San Fransisco is the cost of housing.我对移居旧金山的主要担忧是房价。

More examples

They dropped me off at the main entrance.

Press Esc to return to the main menu.

You'll be examined in three main areas; speaking, listening and reading comprehension.

The main crops grown for export are coffee and rice.

The opportunity to travel is one of the main attractions of this job.

Idiom(s)

be sb's main squeeze
mainnounuk/meɪn/ us/meɪn/

main noun PIPE

[ C ] a large pipe that carries water or gas, or a wire carrying electricity, from one place to another, to which a house can be connected（输送水、煤气的）主管道，总管；（输送电力的）干线

a gas main煤气总管
The severe cold caused a water main to burst and flood the street.严寒使总水管爆裂，水漫街道。
mains [ plural ] UK

the system of pipes or wires that carry water or electricity into a house, or the pipes that carry sewage away from a house（输送水、电的）管道系统；下水道系统

The house isn't on the mains.这座房子尚未接上管道系统。
They bought a house with no mains supply.他们买了一套没有通水电的房子。
mains electricity供电系统的电力
the mains UK

the place at which outside pipes or wires carrying water, electricity, etc. connect with the system inside a house or building内外管道相接处；总阀门；总电源

Switch off the electricity at the mains before starting work.工作前要先关闭总电源。

main noun MOSTLY

in the main

generally or mostly大体上；基本上

Her friends are teachers in the main.她的朋友基本上都是老师。
IELTS BNC: 376 COCA: 888
main

noun¹

 1large pipe大型管道ADJECTIVE | VERB + MAIN | MAIN + VERB ADJECTIVE➤gas, water煤氣／自來水總管道➤broken, burst (BrE) 破裂的／爆裂的總管◇water damage from broken mains主水管破裂造成的水漬損害◇There's a burst water main in Quarry Road.闊里路有一處自來水總管爆裂。➤rising (BrE) 上行總管➤cast-iron (especially BrE) 鑄鐵主管道VERB + MAIN➤lay鋪設主管道◇They're laying a new gas main through the town.他們正在鋪設穿過這個鎮的一條新的煤氣主管道。➤replace替換主管道➤repair修繕主管道MAIN + VERB➤serve sth主管道為⋯服務◇The main serves four towns.這一主管道供 4 個鎮使用。
main

noun²

 2mains (BrE) supply of water, gas or electricity輸水、輸氣、輸電MAINS + NOUN | PREPOSITION | PHRASES MAINS + NOUN➤electricity, gas, water電力／煤氣／自來水供應系統◇an island without mains electricity沒有通電的島PREPOSITION➤at the mains在（水、電、煤氣）源處◇Turn the water off at the mains.把自來水源關掉。➤on the mains接通（水、電、煤氣等）管線◇Some of the remoter houses in the town are not on the mains.鎮裏一些較偏遠的住房還沒通上水、電、煤氣。PHRASES➤connected to the mains接通（水、電、煤氣）管線◇The house is not yet connected to the mains.這所房屋尚未通水電。
IELTS BNC: 376 COCA: 888
main noun
⇨ pipe main

adjective

  ➡ See also the entry for top 另见top条main ♦︎ major ♦︎ key ♦︎ central ♦︎ principal ♦︎ chief ♦︎ prime ♦︎ primary ♦︎ number one ♦︎ predominantThese words all describe sb/sth that is the largest or most important of its kind. 这些词均表示主要的、最重要的。PATTERNS AND COLLOCATIONS 句型和搭配◆to be key / central to sth◆a / the main / major / key / central / principal / chief / prime / primary / number one / predominant concern◆a / the main / major / key / central / principal / chief / prime / primary / predominant purpose / source / factor◆a / the main / major / key / central / principal / chief / prime / primary aim / focus / function / objective / task / reason / consideration◆a / the main / major / principal / chief / prime / primary object◆a / the main / major / key / principal / chief / prime / primary / number one cause◆a / the main / major / principal / chief / primary / predominant effect◆a / the main / major / key / central / principal / chief / prime attraction◆a / the main / major / key / central / principal / predominant theme◆a / the main / major / key / central / principal / prime / primary / predominant role◆a / the main / major / principal / prime / number one contender◆the main / chief / prime / number one suspect◆a / the main / major / principal road / town / city◆the main / key thing is to...◆to be of major / key / central / prime / primary importance■ main [only before noun] largest or most important 主要的；最重要的◆Be careful crossing the main road.过大马路时小心点儿。◆We have our main meal at lunchtime.我们的正餐是午饭。◆The main course was roast lamb.主菜是烤羊羔肉。◆Reception is in the main building.接待处在主楼。◆Please use the main entrance.请走正门。◆Poor housing and unemployment are the main problems.住房差和失业是主要问题。◆ (spoken) The main thing is to remain calm.最重要的是要保持冷静。▸ mainly

adverb

◆They eat mainly fruit and nuts.他们的食物以水果和坚果为主。◆The population almost doubles in August, mainly because of the film festival.主要是电影节的缘故，8月这里的人几乎比平时多一倍。■ major ˈmeɪdʒə(r) [usually before noun] very large or important 主要的；重要的；大的◆A major road runs right through the centre of the town.一条大马路恰好从城中心穿过。◆He played a major role in setting up the system.他对该项制度的建立起了重要作用。◆We have encountered major problems.我们遇到了大问题。ⓘ Major is most often used after a with a singular noun or no article with a plural noun. When it is used with the or my/your/his/her/our/their it means 'the largest or most important'. * major最常用于不定冠词a之后，与单数名词连用；或不用冠词，与复数名词连用。major与the或my/your/his/her/our/their连用时意为“最主要的、最重要的”◆Our major concern here is combatting poverty.在这里我们最关心的是解决贫穷问题。In this meaning it is only used to talk about ideas or worries that people have, not physical things, and it is also more formal than main. 表达此义时，major只用以修饰人的想法或忧虑，而非物质的东西，且较main正式◆Be careful crossing the major road. ◆The major thing is to remain calm. OPP minor ⇨ minor ■ key [usually before noun] most important; essential 最重要的；主要的；关键的◆The key issue here is taxation.这里的关键问题是税收。◆'Caution' is the key word in this situation.在此情形之下，caution为关键词。◆Attitude is a key concept in social psychology.态度是社会心理学中非常重要的概念。ⓘ Key is used most frequently in business and political contexts. It can be used to talk about ideas, or the part that sb plays in a situation, but not physical things. It is slightly more informal than major, especially when used after a noun and linking verb. * key最常用于商务和政治语境，修饰想法或某人在某情形下所起的作用，而非物质的东西。key较major略非正式，用在名词加连系动词后尤其如此◆ (rather informal) Speed is key at this point.在这个时候速度是关键。 ■ central (rather formal) most important; having power or control over other parts 最重要的；首要的；起支配作用的；主导性的◆The central issue is that of widespread racism.最重要的问题是种族主义泛滥。◆She has been a central figure in the campaign.她一直是这场运动的首要人物。◆Reducing inflation is central to (= is an important part of) the government's economic policy.降低通胀是政府经济政策的重点。◆the central committee (= of a political party) 党中央委员会◆The organization has a central office in New York.该组织在纽约设有总部。ⓘ Central is used in a similar way to key, but is more formal. It is most frequently used in the phrase sth is central to sth else and has a slightly smaller range of noun collocates than key. These mostly relate to the part sb/sth plays in sth ( character, component, feature, figure, motif, part, role, theme, topic), what sb is trying to achieve ( aim, focus, issue, preoccupation, problem, recommendation) or ideas that sb has about sth ( belief, concept, doctrine, truth). * central与key用法相似，但更正式，最常用于短语be central to中。与key相比，central可搭配的名词范围略小。这些搭配词大多与某人或某事物所起的作用(character、component、feature、figure、motif、part、role、theme、topic)、某人努力想完成之事(aim、focus、issue、preoccupation、problem、recommendation)或某人对某事物的看法(belief、concept、doctrine、truth)相关。■ principal ˈprɪnsəpl [only before noun] (rather formal) most important 最重要的；主要的◆New roads will link the principal cities.新建道路将连通各主要城市。◆Tourist revenue is now our principal source of wealth.旅游业的收入现在成了我们主要的财富来源。◆My principal concern is to get the job done fast.我最关心的是把工作快点做完。ⓘ Principal is mostly used for statements of fact about which there can be no argument. To state an opinion, or to try to persuade sb of the facts as you see them, it is more usual to use key or central. * principal主要用于陈述无可争辩的事实。表明意见或说服别人相信你所认定的事实，较常用key或central◆The key / central issue here is ...这里的关键问题是⋯ ▸ principally

adverb

◆The tax was very unpopular, principally because it hit the poor hardest.这项税收很不得人心，主要是因为它对穷人的打击最沉重。◆The farms are principally arable.这些农场主要是可耕地。■ chief [only before noun] (especially written) most important 最重要的；主要的◆Unemployment was the chief cause of poverty.失业是贫穷的主要原因。◆Her chief rival for the gold medal is Jones of the USA.她争夺金牌的主要对手是美国的琼斯。ⓘ Chief also means 'highest in rank' when talking about the jobs that people have. In the meaning of 'most important' it is also often used to talk about people in various different roles. * chief修饰职位时意为“最高级别的、首席的”。chief表达“最重要的”之意时亦常修饰担任各种不同角色的人◆sb's chief enemy / rival / opponent某人主要的敌人／竞争对手／对手◆the chief architect / exponent of sth某事主要的缔造者／倡导者 ▸ chiefly

adverb

◆Defence spending was cut, chiefly by reducing national service by six months.主要通过减少六个月兵役来削减国防开支。◆The scientists cannot be held solely or even chiefly to blame.责任不能完全甚至主要由科学家来承担。■ prime [only before noun] (rather formal) most important; to be considered first 最重要的；主要的；首要的◆My prime concern is to protect my property.我最关心的是保护自己的财产。◆The care of the environment is of prime importance.保护环境最为重要。◆He's the police's prime suspect in this case.他是该案中警方的首要怀疑对象。■ primary [usually before noun] (rather formal) prime 最重要的；主要的；首要的◆The primary aim of this class is to improve your spoken English.这门课的主要目的是提高英语会话能力。◆Our primary concern must be the children.我们首要关心的必须是儿童。▸ primarily

adverb

◆In the 1790s Britain was still primarily an agricultural country.18世纪90年代，英国基本上还是个农业国。◆History is after all primarily about people.历史毕竟主要还是人的历史。NOTE 辨析 Prime or primary?In many cases you can use either word. 在许多情况下这两个词可以通用◆your prime / primary concern / purpose / aim / object / objective / task你最关心的事；你的首要目的／目标／宗旨／目标／任务◆to be of prime / primary importance最重要However, prime is used in some fixed collocations where primary cannot be used. 不过，在某些固定搭配中只能用prime，不能用primary◆the prime attraction / contender / suspect主要的景点／竞争者／怀疑对象◆the primary attraction/contender/suspect Primary also has the related meaning of 'earliest' or 'first'. * primary还有一个相关义项，即“最初的、最早的”。   see also primary ⇨ first ■ number one [only before noun] (informal) most important or best 头号的；最重要的；最好的◆Our number one priority is to find larger office space.我们的头等大事是找到大一些的办公场所。◆I just love your work! I'm your number one fan.我真是太爱你的作品了！我是你的头号仰慕者。■ predominant prɪˈdɒmɪnənt; NAmE prɪˈdɑːmɪnənt (rather formal) most obvious or noticeable 显著的；明显的；盛行的◆A predominant feature of his work is the use of natural materials.他的作品的一个显著特征是使用天然材料。◆Yellow is the predominant colour this spring in the fashion world.黄色是今春时装界的主流行色。▸ predominantly

adverb

◆The firm has a predominantly female workforce.该公司的员工以女性居多。◆Ours is a predominantly Buddhist country.我国国民大多信奉佛教。
IELTS BNC: 376 COCA: 888
main
Most important: main, basic, primary...
Plumbing and drainage systems: airlock, back up, blockage...

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