idiom
drop in the ocean
与所需的量相比,非常小或微不足道的数量
Meaning
a very small or insignificant amount compared to what is needed
Example
Our recycling efforts are just a **drop in the ocean** compared to the global pollution problem.
与全球污染问题相比,我们的回收努力只是**海洋中的一滴水**。