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've been through every section with you, Richard.
我和你一起检视过每个部分， Richard。
Like cures like.
以毒攻毒。
I think we're lost! What shall we do?
“我想我们迷路了！我们该怎么办呢？”