Sure. What's up? 当然可以,有什么事吗?
He substituted for his colleague who was ill. 他为生病的同事代班。
Rose will cover for me while I'm away. 我不在的时候,罗斯会帮我代班。
My colleague agreed to cover for me during my vacation. 我的同事答应我休假的时候帮我代班。
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