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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

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