We should delete the unnecessary file from the computer.
我们应把电脑上不需要的文件删除。

In writing this report I have omitted all unnecessary details.

在写这份报告时， 我把一切不必要的细节全都删除了。

Henry canceled many unnecessary words in his manuscript.

亨利在原稿上删去许多不必要的字。

There’s no sense in taking unnecessary risks.

做不必要的冒险毫无意义。

※Lose not time; be always employed in something useful; cut off all unnecessary actions. 不要浪费时间，做些有益的事情，停止一切不必要的行动。

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