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1·If you talk behind someone's back they will always figure out what you're up to.

如果你在背后谈论某人，他们常常就这样看待你。

2·I don't want to talk behind someone's back, but have you noticed the scar on his face?

我不想在背后议论别人，可是你注意到他脸上的刀疤了吗？