Your car isn't fit to be on the road!

　　你的車子還不適合上馬路！

　　How do these two parts fit together?

　　這兩部分如何拼在一起呢？

　　You're not in a fit state to drive.

　　你現在的'狀態不宜開車。

　　They observed how the parts of the machine fitted together.

　　他們觀看了機器零件的組裝過程。