这个消息我是从同事那里听来的，而他也是从别人那里听说的，属于三手信息。

I got this ___thirdhand information from a colleague who heard it from someone else.

这张二手沙发已经有过两位主人，但依然结实耐用。

This ___thirdhand sofa has had two previous owners, but it's still sturdy and functional.