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
She was kicked out of the university.
她被大学开除了。
We've got to get a telepnone stand for the hallway.
我们必须有一部电话放在走廊。
On weekdays, I get up at 6:30.
我平时六点半起床。