ocean ·phrase (IDIOM)
Definition: a very small amount compared to the amount needed Level: C2
我的抗议信只是沧海一粟。
My letter of protest was just ___a ___drop ___in ___the ___ocean.
我知道我只是沧海一粟，但我相信这是唯一的方式，我的方式，来为改善墨西哥的教育做出贡献。
I know I am ___a ___drop ___in ___the ___ocean, but I'm convinced it's the only way, my way, of contributing to improve education in Mexico.
与项目所需资金相比，这笔捐款只是沧海一粟。
The donation was ___a ___drop ___in ___the ___ocean compared to the funds needed for the project.