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 think we're going to be good friends.
我想我们可以成为好朋友。
He can't come and he sends his apologies.
他为他的不能前来致歉。
I admire him for his success in business.
我佩服他事业有成。