HSK 7-9
牢骚
láosāo名
discontent; complaint; to complain
他遇到困难也很少发牢骚。
Tā yùdào kùnnan yě hěnshǎo fā láosāo.
He rarely complains even when he encounters difficulties.
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Appears across levels (7-9) in the HSK 3.0 word list.