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| ADJ |
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| /ˈnesəs(ə)ri/ |
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| 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。 |
| +for basic foods regarded as necessary for health 被认为对健康是必不可少的基本食品 |
| 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？ |
| necessary for sb to do sth 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。 |
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| 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。 |
| PHRASE |
| - | a necessaryevil
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| something that you do not like but that cannot be avoided |
| 不得已的事；难免出现的事 |
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| Paying taxes is a necessary evil. 缴税是难免之事。 |
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