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BNC: 555 COCA: 982
necessary
adjective /ˈnesəs(ə)ri/
  1. 1
    essential or needed in order to do something, provide something, or make something happen 必要的;必需的;必不可少的

    I don't want to be disturbed unless it's absolutely necessary. 除非绝对必要时,我不想被打扰。

    necessary for :

    basic foods regarded as necessary for health 被认为对健康是必不可少的基本食品

    necessary for :

    What type of clothing is necessary for survival at these altitudes? 需要什么样的衣服才能在这样的海拔高度生存?

    it is necessary for someone to do something :

    It was necessary for all students to register a week in advance. 所有学生必须提前一周注册。

    if necessary :

    I can take your place at the meeting tomorrow if necessary. 如果必要的话,明天我可以代你参加那个会议。

    as necessary :

    We'll be adding more workers as necessary (=as they are needed). 我们会按需要增加更多的工人。

     Synonyms and related words
    Necessary: necessary, essential, vital...
  2. 2
    certain to happen or exist 必然的;势必的

    The necessary risks of medicines must be weighed against their benefits. 必须权衡一下服用药物必然存在的风险与它们的好处。

     Synonyms and related words
    Certain or likely to happen: certain, likely, probable...
necessary
noun [C] [usually plural] /ˈnesəs(ə)ri/
singularnecessary
pluralnecessaries
  1. something that is essential 必要的东西;必需品

    I've packed all the necessaries for our outing tomorrow. 我已将明天远足所有必备的物品收拾好了。

     Synonyms and related words
    Important thing or detail: feature, priority, element...

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