Who can measure words?

The word "back" seems to mean that you are not at home or other reasons. First of all, the word "Hui" means that your home is the mouth outside and you are the mouth inside. "Back", there is no gap in the outer port, but the inner port still goes in? This is because the mouth inside melts into the mouth outside. If you are integrated into your family, their external walls can't stop you from coming back to them. Get involved and explain to them. Time is at your disposal. If you don't have time to go home, it depends on whether you want to.