Keepalive message
[计] 存活报文
🧩 词语组成解析
🗣️ 情景例句
I'll go down to Henry's grocery. He's always open.
我到亨利杂货店去。那里总是开门营业的
Please go over it and see if everything is in order.
请过目一下，看看是否一切妥当。
I knew that experts from the local museum would soon visit the cave.
我知道本地博物馆的专家会很快到山洞来探访。