/ə drɒp ɪn ði ˈəʊ.ʃən/ · idiom

a very small amount compared with what is really needed

Hạt muối bỏ biển (quá ít, không thấm vào đâu).

“Recycling at home is just a drop in the ocean, but every little effort still helps.”

Đồng nghĩa

a tiny fraction