its no use doing sth 做某事是没用的。
例句：
Its no use wishing for the impossible.
企求不可能的事情是徒劳无益的。
It's no use hiding me.
我藏起来也没有用处。
Generally speaking, it's no use talking to a person when he's in a temper.
一般来说，当一个人在气头上时，跟他谈话是没有用的。
It's no use arguing with him.
和他争辩也是白搭。
It's no use waiting here any more.
再在这儿等下去已经没意义了。
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