essential, indispensable, necessary
essential a.表示属于某事物的要素或特征是主要的,核心的,本质的,必不可少的。
The essential point is we must do what the contract says.核心的一点是我们必须按照合同的规定去做。
indispensable a.强调客观上是必不可少的,否则就无法维持生命或做不成某一件事。
Warm clothing is indispensable in cold weather.在寒冷的天气里,厚衣服是必不可少的。
necessary a.是一般用语,强调从主观上看是必须的,不可避免的。
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