Singing too loudly at home makes it embarrassing for neighbors to knock at the door.

That's true. At present, many houses have poor sound insulation. If you speak louder, the neighbors can hear you clearly. Just pay attention to yourself in the future, or when singing at home, pay attention to controlling your emotions, and don't be too involved, so as not to disturb your neighbors unintentionally; Or find a place where no one is there, or a park or something, and sing to your heart's content. Of course, KTV is also a good choice if conditions permit.