for no reason

​

If you say that something happened or was done for no reason, for no good reason, or for no reason at all, you mean that there was no obvious reason why it happened or was done.

如果你说某事for no reason、for no reason at all或者for no good reason地发生，你的意思是它发生地毫无源头，毫无原因，无缘无故。

The guards, he said, would punch them for no reason.

他说看守人员们会无缘无故地用拳头打他们。

Grouchy people are always complaining for no reason.

满腹牢骚的人总是毫无理由地抱怨。