What are the functions of two doors in the kitchen?

The entrance door is the vent of the open kitchen, which represents people's mouth, trachea, respiratory tract and digestive tract in health. So door to door, easy to cause oral litigation. The kitchen door is easy to cause problems in the mouth, teeth, breathing and digestive tract. The entrance door is bad for the kitchen door, and it is bad for the kitchen and the hostess at home. Consider buying a big bead curtain.