1, a drop in the ocean, is an idiom in China, pronounced as cā ng h m: i y: and si, which means a drop in the ocean. Metaphor is small and insignificant. From the stone "Former Red Cliff Fu": "Mayflies are sent to heaven and earth, and they are one of the millet in the vast sea of people."

2, synonym nine Niu Yi hair, Taicang a drop in the bucket, insignificant.

3, the antonym Ganges sand number.

4. Idiom usage: formal; As predicate and object; Refers to trivial matters.