杯水車薪

Simplified: 杯水车薪

bēishuǐchēxīn ㄅㄟ ㄕㄨㄟˇ ㄔㄜ ㄒㄧㄣ

    • lit. a cup of water on a burning cart of firewood (idiom) fig. an utterly inadequate measure

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Sources