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
What's the exchange rate today?
今天的兑换比率是多少？
This is an interesting floor plan.Please show me the basement.
这是一有趣的平面布置.请给我看一下地下室。
It's the most expensive model in the shop.
这是店里最贵的型号。