to bring sand to the beach
01
쓸데없는 일을 하다, 괜한 수고를 하다
to do something that is considered to be redundant or useless
idiom
예시들
The company's attempt to create a new product that was already available from many competitors was like bringing sand to the beach.
정수기가 있는 집에 생수를 사 가는 건 쓸데없는 일처럼 느껴졌다.



























