Preorder traversal
[计] 前序遍历
🧩 词语组成解析
[计] 先根次序
[计] 遍历
🗣️ 情景例句
I lost.
我输了。
What would you like to do this weekend?
这周末你打算做什么？
I entered the hotel manager's office and sat down.
我走进饭店经理的办公室，坐了下来。