N a person who displays conspicuous diligence, esp one who volunteers for extra work (尤指自愿做额外工作的)特别卖力的人 [非正式]
Being an eager beaver, he sometimes is not well-liked by his colleagues.
他做事非常卖力，有时不受同事的喜欢。
The boy is an eager beaver. All of us like him.
他是个勤快的小伙子，大伙儿都喜欢他。
You know that a person who works very hard is often described as an "eager beaver" or "busy beaver.
你们知道，工作非常勤奋的人常常被描绘成“卖力的河狸”或“忙碌的河狸”。
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