| 单词 | necessary |
| 释义 | necessarynecessary /ˈnɛsəˌsɛri/ ●●● S2 W1 adjective 1needed in order for you to do something or have something: You’ll find all the necessary information in this booklet.necessary for Calcium is necessary for strong teeth and bones.it is necessary (for somebody) to do something It’s not necessary for you to stay – we have plenty of help. The bad weather made it necessary for us to change our plans. Add more salt and pepper if necessary. Don’t call me unless it’s absolutely necessary (=completely necessary).THESAURUSessential – necessary in order for something to happen or be done: Oxygen is essential for animals and plants to live.vital – something that is vital is extremely important and necessary so that without it there will be serious problems: He was accused of withholding vital information from the police.crucial/critical – something that is crucial or critical is important and necessary because other things depend on it: The information was crucial to building a case against the accused murderer. Having a positive attitude is critical to achieving your goals.mandatory/compulsory/obligatory – something that is mandatory, etc., must be done because of a rule or law: Parents do not want school uniform to become mandatory. Service in the army was compulsory.requisite formal – needed for a particular purpose: He lacked the requisite skills for the job.indispensable formal – something or someone that is indispensable is so important or useful that something cannot be done without that person or thing: The accounting program is indispensable for small businesses.imperative – extremely important and needing to be done: It is imperative that you report back to me as soon as you are finished.2a necessary evil something bad that you have to accept in order to achieve what you want: I consider yard work to be a necessary evil. [Origin: 1300–1400 Latin necessarius, from necesse necessary, from ne- not + cedere to give up] → see also necessaries |
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