necessary; essential; indispensable
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有必要作进一步的调查。
It is necessary to make a further investigation.
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水对维持大草原的生态环境是绝对必要的。
Water is essential to the preservation of the ecology of the steppe.
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车虽然有用,但不是必要的。
A car is useful but not indispensable.
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如果必要的话
if necessary; if need be; if the need arises; should it be necessary
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必要的组成部分
necessary component
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必要的准备
necessary preparations
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必要的时候
as occasion demands; when the need arises
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必要的生产资料
necessary means of production