Don't lean out of the window.

别把身子探出窗外。

Don't lean out of the window!

不要把身体探出车窗外。

Don't lean out of the bus window.

不要把身体探也车窗外。

To lean out of the window is dangerous.

把身子伸出窗外是危险的。

It is dangerous to lean out of the window.

探身窗外是危险的。