他派我去干白费力的事。
He sent me on a fool's errand.
《牛津词典》
每次你想要一起放一个营销计划时你不必白费力气做同样的事。
You don't have to reinvent the wheel every time you want to put a marketing plan together.
youdao
过去的事哭也是白费力气。
It is no use crying about the past.
It is useless; he would not come up.
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