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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 另見essential條necessary ♦︎ compulsory ♦︎ mandatory ♦︎ requisite ♦︎ obligatory ♦︎ forced ♦︎ involuntaryThese words all describe sth that sb has to do or have. 這些詞均表示必須做的、必要的、強制性的。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.也許有必要買個新的了。◆Only use your car when absolutely necessary.不得已時才開車。◆If necessary, you can contact me at home.必要的話，我在家時你也可以和我聯系。◆I'll make the necessary arrangements.我會做一些必要的安排。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 （按法律或規定）必須做的，強制的◆It is compulsory for all motorcyclists to wear helmets.所有騎摩托車的人都必須強制戴頭盔。◆English is a compulsory subject at this level.英語在這一級别是必修科目。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）必須做的，強制的◆It is mandatory for blood banks to test all donated blood for the virus.血庫一律要按規定檢查所有捐獻的血液是否含有這種病毒。◆The offence carries a mandatory life sentence.這種罪行依照法律要判無期徒刑。■ requisite ˈrekwɪzɪt [only before noun] (formal) necessary for a particular purpose 必需的；必備的；必不可少的◆She lacks the requisite experience for the job.她缺少做這份工作所必需的經驗。■ obligatory əˈblɪgətri; NAmE əˈblɪgətɔːri (formal) that must be done because of a law or rule （按法律或規定）必須做的，強制的◆It is obligatory for all employees to wear protective clothing.所有員工必須強制穿防護服。ⓘ 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有時用於名詞前，描述常有的或常做的但根本無甚必要的事，爲幽默用法◆The hotel has a terrace with comfy chairs for that obligatory cocktail.這家旅館有個露台，擺放着舒適的椅子，供人們喝上一杯那似乎是不可或缺的雞尾酒。 OPP optional ⇨ voluntary 1 NOTE 辨析 Compulsory, mandatory or obligatory? Compulsory is used especially in the contexts of education, business and employment. * compulsory尤用於教育、商務和職業語境◆compulsory education / schooling / reading / subjects義務教育；必讀材料；必修科目◆compulsory insurance / liquidation / purchase / redundancy / retirement強制性保險；強制清算／購買／裁員／退休 Mandatory is used especially in the context of the law. * mandatory尤用於法律語境◆a mandatory sentence / penalty / duty / requirement法定判決；依法懲處；法定義務／條件 Obligatory is often used to talk about rules and laws relating to safety, for example in sport or the workplace. * obligatory常用於描述跟安全相關的規定和法律，如體育運動的規則或工作場所的規章◆Recently safety regulations have made it obligatory for all competitors to wear fist protectors.最近，所有參賽者都必須按安全規定戴拳套。 ■ forced [usually before noun] happening or done without you wanting it to 被迫的；不得已的；非自願的◆Many are unhappy about the forced repatriation of the refugees.很多人對強制遣返難民感到不滿。◆I hope there will be no need for the forced sale of any property.我希望不會有強行變賣財産的必要。■ 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；非自願的◆The distinction between voluntary and involuntary unemployment is often blurred.自願失業和非自願失業之間的區分往往很模糊。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指受環境所迫或所限◆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. 不過，involuntary可用於指事實上是另一個人的行爲或決定迫使某人做某事，是forced較爲正式和不太直接（或不太坦率）的說法◆the forced / involuntary repatriation of the refugees對難民的強制性遣返

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