be (like) banging/bashing etc your head against a brick wallCONTINUE/NOT STOP spoken used to say that you are making no progress at all in what you are trying hard to do 枉费心机，白费气力 I’ve tried to talk some sense into them, but it’s like banging my head against a brick wall. 我拼命跟他们讲道理，但结果是白费唇舌。
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