英语语法分析

And what role does a sunroof play?

天窗又能起什么作用呢？

Would it be OK if you opened the sunroof or a window while smoking?

有人提出，如果在车内吸烟时打开车顶窗或车窗能否解决这一问题。

Of course, the most efficient car is one with the AC off and the Windows and sunroof closed.

当然，最省油的车是把空调关掉，车窗和天窗也都关上。