necessary for
definitions
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Required to achieve a specific result, purpose, or goal; an essential prerequisite.zh: 对...是必要的
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Essential for the continued existence, survival, or maintenance of something.zh: 对生存必不可少
examples
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Hard work is necessary for success.
努力是成功的必要条件。
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Water is necessary for all living organisms.
水对所有生物都是必需的。