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
He is with someone right now. Would you hold?
他现在在会客。你可以稍等吗？
It's only a suggestion,and you can do what you please.
它仅仅是一个建议，你能做你喜欢的东西。
Such creatures have rarely been seen alive by man as they live at a depth of six hundred feet.
人们很少能看到活着的这类动物，因为它们生活在600英尺深的水下。