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BNC: 555 COCA: 982

B1 needed in order to achieve a particular result必需的,必不可少的

He lacks the necessary skills for the job.他不具备做这项工作所需的技能。
I don't have much time so I won't be staying any longer than necessary.我时间不多,所以若非必要我不会逗留。
Just do what's necessary and then leave.做完必要的事情就走吧。
If necessary, we can always change the dates of our trip.必要的话,我们随时可以改变旅行的日期。
Is it necessary for all of us to be present at the meeting this afternoon?我们必须全体出席今天下午的会议吗?
We don't want to take any more luggage with us than is strictly necessary.除了必不可少的行李以外,我们不想带多余的东西。

used in negatives and questions to show that you disapprove of something and do not think it should be used or done(用于否定句和疑问句表示不赞同)必要的,应该的

I don't think that kind of language is necessary in a show that kids could be watching.我真的认为在电视上使用那种语言是不可取的。
Was it really necessary for you to say that?你非得那样说吗?

More examples

If you're going into teaching, energy is a necessary commodity.

Some alterations to our original plans might be necessary.

We shall do everything necessary to bring the murderer to justice.

We can always go back to the original plan if necessary.

No purchase is necessary for you to enter this competition.

BNC: 555 COCA: 982
necessary

adjective

VERBS | ADVERB | PREPOSITION | PHRASES VERBSappear, 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。ADVERBreally, 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PREPOSITIONfor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PHRASESif 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 sthit's necessary / compulsory / mandatory / obligatory to do sthforced / involuntary repatriationalmost / 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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