Your car isn't fit to be on the road!
你的車(chē)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(xiàn)在的'狀態(tài)不宜開(kāi)車(chē)。
They observed how the parts of the machine fitted together.
他們觀(guān)看了機(jī)器零件的組裝過(guò)程。