This makes 2-4 trees an important tool for understanding the logic behind red–black trees, and this is why many introductory algorithm texts introduce 2-4 trees just before red–black trees, even though 2-4 trees are not often used in practice.
这使得2-3-4树成为理解红黑树背后的逻辑的重要工具，这也是很多介绍算法的教科书在红黑树之前介绍2-3-4树的原因，尽管2-3-4树在实践中不经常使用。