忙于工作的英文:
be at it

参考例句:
  • I hate to interrupt a man when he's busy working.
    "一个人忙于工作时,我最不愿打搅了。"
  • As everyone is busy at his or her work usually, the people would gradually be estranged from each other.
    平时,大家都忙于工作,人和人之间关系也会慢慢地疏远。

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