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Sentence examples
瞎费劲
xiā fèijìn
futile efforts
他学英语不费劲
tā xué yīngyǔ bù fèijìn
he has no trouble learning English
路子不对等于白费劲儿
lùzǐ búduì děngyú báifèi jìnér
the wrong approach means a waste of effort
这没那么费劲
zhè méi nàme fèijìn
It's not that hard
别白费劲了
bié báifèi jìn le
don't waste your time
