So from my understanding, I could be wrong, I've seen videos on this, but when you make march in japan, you have one person hitting the march in one person just rotating it and I think it's because you want to let more air into the march, you so you've got the consistency.
所以根據我的理解,我可能是錯的,我看過這方面的視頻,但是當你在日本做行軍時,你有一個人在打行軍,一個人只是旋轉它,我想這是因為你想讓更多的空氣進入行軍,你就有了一致性。