eager beaver
热心而勤奋的人
口语·形容勤奋热心
英文释义
someone who is very enthusiastic, hardworking, and eager to please or to participate
例句
The new intern is such an eager beaver, always asking for extra tasks.
典故来源
源自海狸勤劳筑坝的习性，比喻人像海狸一样热情、勤奋。