必需;
Air be indispensable to life.
生命离不开空气.
The hot water rinse was found to be indispensable to remove the soap.
为除去皂液,用热水冲洗是必要的.
It was flattering to be told how indispensable his taste and talent were.
被告知自己的品味和才能如此不可或缺,他心里非常高兴。
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