◎杯水車薪bēishuǐ-chēxīn
[a cup of water can't put out the fire on a carload of wood;try to put out a burning cartload of faggots with a cup of water—an utterly inadequate measure] 用一杯水去撲滅一車燃燒的柴草。比喻力量太小，無濟于事
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