如果打比方说这个球拍是羽毛球之树，那么这5条原则就是这棵树的5个根。

Let's say, if this racket is a badminton tree, I believe there are 5 roots.

youdao

如果打比方说这个球拍是羽毛球之树，那么这5条原则就是这棵树的5个根。

Let's say, if this racket is a badminton tree, I believe there are 5 roots.

youdao