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
and pleased to be living with the family.
乐于跟家人住在一起。
Wit without learning is like a tree without fruit.
仅有机智而无真才实学，犹如一棵大树不结果。
Give me some glasses please, Jane.
请拿给我几只玻璃杯，简。