没必要的英文：
it is not necessary (for sb to do)

参考例句：

We don't have to fart to amuse ourselves.
我们没必要去用放屁来寻开心。

There's no need for the manager to labour the point.
经理没必要对这一点啰唆。

You don't have to sit bolt upright
你没必要挺直地坐着。

It won't be necessary for him to report to the police.
他没必要去报告警察。

You needn't have gone to the meeting.
你本没必要去开会。

I don't think it's necessary for you to compromise with him.
我认为您没必要同他妥协。

Your argument was clear to us from the start there' s no need to labour the point
你的论点一开头我们就清楚了--没必要一再重复

He did not feel he had got to know them intimately.
他认为他没必要和他们亲密来往。

The play was so regularly performed that there was no need of written prompts.
这戏经常演出，没必要使用书面提示。

Not all the tools are essential; some are useful but not absolutely necessary and can be purchased as desired.
没必要配备所有的工具,有些工具有用但不是绝对需要,可根据需要购买工具。

necessary是什么意思：
adj. 必要的；必需的；必然的；不可避免的
n. 必需品

It is necessary to delimit the anomaly clearly.
清楚地圈定异常是必要的。

The redress of mistakes is necessary.
纠错是必要的。

It's necessary to operate on him.
必须给他做手术。

Cases it deems necessary to try.
认为应当由本院审理的案件。

It is necessary to delimitate the anomaly clearly.
清楚地圈定异常是必要的。