Clew 4: Prevent neighbour lampblack to enter a to prevent lampblack flow backward, the platoon a place with a draught of the kitchen, close the door needs to shut when going out for a long time rise.

• 提示四：防止邻居油烟进家为了防止油烟的倒灌，厨房的排风口、封闭门在长期外出的时候需要关闭起来。