Keepalive message
[计] 存活报文
🧩 词语组成解析
🗣️ 情景例句
Shells she sells on the seashore are seashells I am sure.
我敢肯定她在海边卖的贝壳是海贝。
Nobody's at home.
家里面没人。
Who is this young man?
这个年轻人是谁？