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
OK. Is that all?
好的。就这样完了吗？
At noon I had lunch with a friend of mine.
在中午我与一个朋友一起吃了午餐。
The other was much farther away from the hive.
另一个远离蜂箱。