Inorder traversal
[计] 中序遍历
🧩 词语组成解析
[计] 中根次序
[计] 遍历
🗣️ 情景例句
Always full of surprises.
总是出人意表。
New brooms sweep clean.
新官上任三把火。
and we have only to turn to that extraordinary discovery of echo-location in bats to see a case in which the voice plays a strictly utilitarian role.
我们只要看一看蝙蝠回声定位这一极不寻常的发现，就可以探究一下声音在什么情况下有绝对的实用价值。