drop in the bucket
沧海一粟，微不足道的贡献
口语·书面语，表示贡献或数量微不足道
英文释义
something that is considered to be small in comparison to the whole or the overall need
例句
The donation was generous, but it's just a drop in the bucket compared to what's needed.
典故来源
源自《圣经》中以赛亚书，比喻一滴水之于水桶，形容数量微小，与整体需求相比微不足道。