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
know that I'm running for office
知道我正在竞选公职，
I often go out in the morning.
我常常在早上出门。
What about your bag? Would you like me to carry it?
手提包呢？您要我提吗？