当你离开的时候，确信所有的灯都关了。

Make sure all the lights are turned off when you leave.

youdao

在离开教室前，请确认一下所有的灯都关了。

Before leaving the classroom, please make sure that all the lights are off.

youdao

当我们离开教室，我们要确保所有的灯都关了。

When we leave classroom, we should make sure that all the light are off.

youdao

当我们离开教室，我们要确保所有的灯都关了。

When we leave classroom, we should make sure that all the light are off.

youdao