My mother often opens the windows and let the fresh air in at nine o'clock in the morning.
不明白的再问哟,请及时采纳,多谢
翻译成英文：我妈妈经常在上午九点给房间通风.
My mother often opens the windows and let the fresh air in at nine o'clock in the morning.
不明白的再问哟,请及时采纳,多谢