Can you explain the steps of preorder traversal?

你能解释一下前序遍历的步骤吗？

Depth-first traversal is often used in graph theory.

深度优先遍历常用于图论中。

The traversal of the maze took longer than expected.

迷宫的遍历比预期的时间要长。

The order of preorder traversal is root, left, right.

前序遍历的顺序是根、左、右。

The algorithm requires a traversal of the entire list.

该算法需要对整个列表进行遍历。

In tree traversal, preorder visits the root node first.

在树的遍历中，前序遍历先访问根节点。

We need to use preorder traversal to solve this problem.

我们需要使用前序遍历来解决这个问题。

A traversal of the directory revealed several hidden files.

对目录的遍历揭示了几个隐藏文件。

The preorder traversal of this algorithm is well implemented.

这个算法的前序遍历实现得很好。

The data structure is acyclic, which simplifies traversal operations.

该数据结构是非循环的，这简化了遍历操作。