Density current
[化] 异重流
🧩 词语组成解析
🗣️ 情景例句
What time is it?
现在是什么时间了？
Is it raining now?
现在正在下雨吗？
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。