... 费力不讨好 do a hard but thankless job 费劲 need or use great effort 费口舌 require a lot of talking ...
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... 费人思索 exhaust one's mind to think 费力 need or use great effort 费力不讨好 do a hard but thankless job ...
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[need or use great effort;be strenuous] 耗费力量,多指耗费较多的力量 [may I trouble you(to do sth.
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