Keepalive message
[计] 存活报文
🧩 词语组成解析
🗣️ 情景例句
We're a family, Harry.
我们是一家人， Harry。
Are most people against the proposal?
是多数人都反对这个提议吗？
it is now possible not only to locate a shoal but to tell if it is herring, cod, or other well-known fish, by the pattern of its echo.
不仅能够确定鱼群的位置，而且可以根据鱼群回声的特点分辨出是鲱鱼、鳕鱼，这是人们所熟悉的其他鱼。