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用心良苦 - Idiom detail

Idiom 用心良苦
Pinyin yòng xīn liáng kǔ
Description 用心认真思考;良很≤费心思地反复思考。
Example
Derivation 清·钱谦益《题怀麓堂诗钞》孟阳于恶疾沉痼之后,出西涯之诗疗之,曰‘此引年之药物,亦攻毒之箴砭,其用心良亦苦矣。’”
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