每日商務英語 第543期:杯水車薪

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a drop in the bucket------杯水車薪（成語）

英文釋義
(IDIOM) A very small and insufficient amount of something.

例句
When I was a university student the money my family gave me was just a drop in the bucket because my living expenses were so high.
我上大學時生活成本太高，家裏給我的錢只是杯水車薪。