杯水车薪
[杯水車薪]
bēi shuǐ chē xīn
a cup of water to put out a cartload of firewood
an utterly inadequate measure

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Note: I understand 车 [車] as meaning a cartload of rather than a literal cart that is full of firewood here. (Well, it wouldn’t be literal anyway, I suppose, since it’s an idiom, but you know what I mean. I deliberatedly didn’t put a cart in the picture, is my point.)