be (of) no use idiom
B2 没有用;没有帮助;不可能
to not be useful, helpful, or possible
His advice turned out to be no use at all. 结果证明他的建议一点儿用处都没有。
There is no use (in) arguing any more. 再争下去已没有什么用了。
It is no use trying (= there is no purpose in trying) to escape - no one ever gets out of here. 想逃跑是没门儿的——还没有人从这儿逃出去过。
It's no use (= I cannot succeed) - I just can't get this lid off. 我没辙了——这个盖子我怎么也弄不开。