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 don't want to.
我不想见。
One cannot always be a hero, but one can always be a man.
人难一世称雄，但可一生为人。
Of course, I have! It's all around us!
我当然看到了，我们周围都是海！