You can't leave from here.

你不能从这里出去。

What track does the train leave from?

这班火车从哪条轨道出发？

Where does the train leave from?

这火车从何处开出的？

You can's leave from here.

你不能从这里出去。

What platform does the train leave from？

这班车从哪个站台开出呢？