我在披萨店为家人点餐时正在打电话。

我在披萨店为家人点餐时正在打电话。

I was in the pizza shop to order some food for my family and I was on the phone.

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I was in the pizza shop to order some food for my family and I was on the phone.

on 在这里表示"处于某种状态或活动中",on the phone 是一个固定搭配,意思是"正在打电话"或"正在通话中"。

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