Ectohumus
[地质]外腐殖质
🗣️ 情景例句
Thank my son Robbie.
谢我儿子Robbie吧。
Sorry kept you waiting so long. You are on .
抱歉让你久等了，接通了。
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。