I have to finish the needful today.

我今天必须把需要的东西做完。

I will connect with you when needful.

我会在必要的时候联系你。

His last book, "Needful Things," was a retread of tired material.

他的上一本书《必需品》尽在重复些陈旧的内容。

The section of society most needful of such guidance is the young male.

最需要此类指导的社会群体是青年男性。

Thou should'st rest is indeed a needful thing, since thou must journey to the city presently.

您应该休息一下，这非常有必要，因为您不久就要到城里去了。

This is the one thing needful .

这是唯一需要的东西。

A good law is needful for the good of the people.

一部好的法律对人民是必要的。