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
Well! Nice restaurant.
嘿， 这是一家好餐厅。
Despair gives courage to a coward.
人急造反，狗急跳墙。
I hid in a farmer's cart which was taking vegetables into the castle.
我藏在一个农民的车子里，车子正往城里送菜。