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BNC: 555 COCA: 982

necessary

adjective
 OPAL W
/ˈnesəsəri/
/ˈnesəseri/
Idioms
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  1.  
     that is needed for a purpose or a reason必需的；必要的 synonym essential
    • necessary to do something It may be necessary to buy a new one.也许有必要买个新的了。
    • necessary for somebody to do something It doesn't seem necessary for us to meet.我们似乎没必要见面。
    • necessary for something Food is necessary for survival.食物是生存所必需的。
    • I'll make the necessary arrangements.我会做一些必要的安排。
    • Radical change was a necessary step for reform.彻底的变革是改革的必要步骤。
    • if necessary If necessary, you can contact me at home.必要的话，我在家时你也可以和我联系。
    • when necessary Only use your car when absolutely necessary.非用不可的时候才用你的汽车。
    • where necessary Changes can easily be made where necessary.必要时可以很容易地进行更改。
    • He has the expertise necessary to make it work.他有必要的专业知识使其发挥作用。
    • I was determined not to stay in hospital for any longer than was strictly necessary.我决定， 除非极为必要， 否则决不在医院多呆一天。
    Extra Examples
    • She has the qualities necessary to be a successful teacher.她具备成为一名成功教师所必需的素质。
    • The owner failed to take the steps necessary to ensure the residents' safety.业主未能采取必要措施确保居民的安全。
    • Make any alterations you consider necessary.你认为有必要的都可以修改。
    • The cold weather has made it necessary to protect the crops.天气寒冷，庄稼必须加以保护。
    • These measures will be enforced, if necessary, by the army.如果必要，军队会强制执行这些措施。
    • We are here to give help and support when necessary.如有需要，我们随时提供帮助和支援。
    • You may find it necessary to readjust the wheels from time to time.你可能会发现不时调整轮子很有必要。
    • qualifications which are necessary for work with the under-fives照顾 5 岁以下儿童必需的资格
    Oxford Collocations Dictionaryverbs
    • appear
    • be
    • prove
    • …
    adverb
    • really
    • strictly
    • absolutely
    • …
    preposition
    • for
    phrases
    • if necessary
    • as necessary
    • when necessary
    • …
    See full entry
  2.  
     [only before noun] that must exist or happen and cannot be avoided必然的；无法避免的 synonym inevitable
    • This is a necessary consequence of progress.这是事情发展的必然后果。
    • A necessary condition for a steep fall in demand is a widespread collapse in confidence.要使需求陡降，一个必要条件是人们普遍丧失信心。
    Topics Permission and obligationb2
    3. Word Originlate Middle English: from Latin necessarius, from necesse ‘be needful’.
Idioms
a necessary evil
  1. a thing that is bad or that you do not like but that you must accept for a particular reason无法避免的坏事；不得已的事
    • The loss of jobs is regarded as a necessary evil in the fight against inflation.失业被认为是与通货膨胀斗争中的一个必然的祸害。
BNC: 555 COCA: 982
necessary

adjective

VERBS | ADVERB | PREPOSITION | PHRASES VERBS➤appear, be, prove, seem顯得必要；必要；證明必要；看似必要▸➤become變得必要▸➤remain仍然必要▸➤make sth使⋯成為必要◇The cold weather has made it necessary to protect the crops.天氣寒冷，莊稼必須加以保護。➤believe sth, consider sth, deem sth, feel sth, find sth, regard sth as, see sth as, think sth相信⋯必要；認為⋯必要；視⋯為必要；感覺⋯必要；發現⋯很必要◇Make any alterations you consider necessary.你認為有必要的都可以修改。◇You may find it necessary to readjust the wheels from time to time.你可能會發現不時調整輪子很有必要。ADVERB➤really, strictly確實／完全必要◇I was determined not to stay in the hospital for any longer than was strictly necessary.我決定，除非極為必要，否則決不在醫院多待一天。➤absolutely絕對必要➤hardly幾乎無需▸➤logically邏輯上必要▸➤medically醫學上必要PREPOSITION➤for對⋯必要◇qualifications which are necessary for work with the under-fives照顧 5 歲以下兒童必需的資格PHRASES➤if necessary如果必要的話◇These measures will be enforced, if necessary, by the army.如果必要，軍隊會強制執行這些措施。➤as necessary, when necessary, where necessary需要時；必要處◇We are here to give help and support when necessary.如有需要，我們隨時提供幫助和支援。◇Editorial changes have been made where necessary.在必要之處作了編輯上的改動。
BNC: 555 COCA: 982
necessary adj.
⇨ necessary (necessary to do sth) ⇨ inevitable (a necessary condition/consequence) necessary

adjective

  ➡ See also the entry for essential 另见essential条necessary ♦︎ compulsory ♦︎ mandatory ♦︎ requisite ♦︎ obligatory ♦︎ forced ♦︎ involuntaryThese words all describe sth that sb has to do or have. 这些词均表示必须做的、必要的、强制性的。PATTERNS AND COLLOCATIONS 句型和搭配◆it's necessary / compulsory / mandatory / obligatory for sb to do sth◆it's necessary / compulsory / mandatory / obligatory to do sth◆forced / involuntary repatriation◆almost / legally compulsory / obligatory■ necessary that is needed for a purpose or a reason 必需的；必要的◆It may be necessary to buy a new one.也许有必要买个新的了。◆Only use your car when absolutely necessary.不得已时才开车。◆If necessary, you can contact me at home.必要的话，我在家时你也可以和我联系。◆I'll make the necessary arrangements.我会做一些必要的安排。OPP unnecessary ⇨ unnecessary   see also necessary ⇨ inevitable , necessitate ⇨ mean verb 3 ■ compulsory kəmˈpʌlsəri (rather formal) that must be done because of a law or rule （按法律或规定）必须做的，强制的◆It is compulsory for all motorcyclists to wear helmets.所有骑摩托车的人都必须强制戴头盔。◆English is a compulsory subject at this level.英语在这一级别是必修科目。OPP voluntary , optional ⇨ voluntary 1   see also compulsion ⇨ pressure 2 ■ mandatory ˈmændətəri; NAmE ˈmændətɔːri, BrE also mænˈdeɪtəri (formal) that must be done because of a law （按法律）必须做的，强制的◆It is mandatory for blood banks to test all donated blood for the virus.血库一律要按规定检查所有捐献的血液是否含有这种病毒。◆The offence carries a mandatory life sentence.这种罪行依照法律要判无期徒刑。■ requisite ˈrekwɪzɪt [only before noun] (formal) necessary for a particular purpose 必需的；必备的；必不可少的◆She lacks the requisite experience for the job.她缺少做这份工作所必需的经验。■ obligatory əˈblɪgətri; NAmE əˈblɪgətɔːri (formal) that must be done because of a law or rule （按法律或规定）必须做的，强制的◆It is obligatory for all employees to wear protective clothing.所有员工必须强制穿防护服。ⓘ Obligatory is sometimes used humorously before a noun to talk about sth that often exists or is done, but that is not really necessary at all. * obligatory有时用于名词前，描述常有的或常做的但根本无甚必要的事，为幽默用法◆The hotel has a terrace with comfy chairs for that obligatory cocktail.这家旅馆有个露台，摆放着舒适的椅子，供人们喝上一杯那似乎是不可或缺的鸡尾酒。 OPP optional ⇨ voluntary 1 NOTE 辨析 Compulsory, mandatory or obligatory? Compulsory is used especially in the contexts of education, business and employment. * compulsory尤用于教育、商务和职业语境◆compulsory education / schooling / reading / subjects义务教育；必读材料；必修科目◆compulsory insurance / liquidation / purchase / redundancy / retirement强制性保险；强制清算／购买／裁员／退休 Mandatory is used especially in the context of the law. * mandatory尤用于法律语境◆a mandatory sentence / penalty / duty / requirement法定判决；依法惩处；法定义务／条件 Obligatory is often used to talk about rules and laws relating to safety, for example in sport or the workplace. * obligatory常用于描述跟安全相关的规定和法律，如体育运动的规则或工作场所的规章◆Recently safety regulations have made it obligatory for all competitors to wear fist protectors.最近，所有参赛者都必须按安全规定戴拳套。 ■ forced [usually before noun] happening or done without you wanting it to 被迫的；不得已的；非自愿的◆Many are unhappy about the forced repatriation of the refugees.很多人对强制遣返难民感到不满。◆I hope there will be no need for the forced sale of any property.我希望不会有强行变卖财产的必要。■ involuntary ɪnˈvɒləntri; NAmE ɪnˈvɑːlənteri [usually before noun] (rather formal, written) happening or done without you wanting it to 被迫的；不得已的；非自愿的◆The distinction between voluntary and involuntary unemployment is often blurred.自愿失业和非自愿失业之间的区分往往很模糊。OPP voluntary ⇨ voluntary 1 NOTE 辨析 Forced or involuntary? Forced often suggests that sb is forcing sb to do sth; involuntary suggests that it is circumstances, not another person, that forces sb to do or be sth. * forced常指受他人所迫，involuntary指受环境所迫或所限◆forced unemployment However, involuntary can also be used when it is in fact the actions or decision of another person that forces sb to do sth, as a more formal and less direct (or less honest) way of saying forced. 不过，involuntary可用于指事实上是另一个人的行为或决定迫使某人做某事，是forced较为正式和不太直接（或不太坦率）的说法◆the forced / involuntary repatriation of the refugees对难民的强制性遣返
BNC: 555 COCA: 982
necessary
Necessary: necessary, essential, vital...
Certain or likely to happen: certain, likely, probable...
Important thing or detail: feature, priority, element...

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