bench warmer 坐冷板凳，任闲职者（体育）

英文释义

a player who is seldom brought into a game, but usually just sits on a bench off to the side watching the more important players.

例句

When I work for a company, I like to work hard and make a real contribution; I don’t like to be merely a bench warmer.

我为某家公司工作时，我喜欢努力工作并做出实际的贡献，不想干闲职。