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a drop in the bucket------杯水车薪（成语）
英文释义
(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.
我上大学时生活成本太高，家里给我的钱只是杯水车薪。
n. 水桶
vt. 装在桶里
vi.
