All the Windows of the classroom are open.
教室里的窗户，全部都开开的。
The classroom whose window is open is mine.
窗户开着的那个教室是我的教室。
He left the classroom with the door open.
他离开教室了，门却开着。
I went outside a classroom and students, gently pushed open the door.
我和同学走到教室外面，轻轻推开门。
Open up the second classroom, stretch the classroom instruction.
开辟第二课堂，延伸课堂教学。
Don't leave the door open after you leave the classroom.
不要让门开着就离开教室。
Don't leave the door open after you leave the classroom.
不要让门开着就离开教室。
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