bee是勤劳的小蜜蜂，所以as busy as a bee的意思是“忙得不可开交”、“忙得团团转”。

【例句】
As a mother of three kids, she is always as busy as a bee.
作为三个孩子的母亲，她总是忙得焦头烂额。

He is as busy as a bee trying to put the house in order.
他为了要把家里弄得整整齐齐，忙得团团转。