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
Give me a cup of coffee, please.
请给我一杯咖啡。
We hope that you will earnestly take part in this meeting.
我们希望你们认真地参与本次会议。
What can I do for you, Sharon?
莎伦，我能为你做什么？（你哪不舒服？）