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a drop in the ocean

A tiny amount, especially when compared to a much larger one.

极其小的一部分，特别是与更大的一个相比；沧海一粟，九牛一毛

I'm glad Tony started repaying the money he borrowed from me, but the five dollars he gave me yesterday is just a drop in the ocean compared to what he still owes.

我很高兴托尼开始偿还从我那里借来的钱，但他昨天给我的五块钱，与他的借的相比只是九牛一毛。

$10 million is only a drop in the ocean compared to what is needed to help these people effectively.

与有效帮助这些人所需要的相比，1000万美元只是沧海一粟