Alternando
更比定理
🗣️ 情景例句
I understand you used to be in the construction business,
听说你过去从事建筑业
My sister worked as a secretary before she got married.
在她结婚了以前，我的姐姐为一位秘书。
I hate to interrupt a man when he's busy working,
当一个人在忙着干活时，我是不愿意去打断他的，