In Mohe, the northernmost part of the motherland, I heard about it on the radio when I was very young. Many places there think that four is auspicious. Even on New Year's Eve and the fourth day of New Year's Eve, there are two years, and one year is not enough. I want to spend two days (I don't know whether it is the fourth day, the fourth day, the fifth day, or the fourth day, the fourth day and the sixth day after the second day of junior high school, hmm. . . )。