Thanks for everything, if you ever need a favor in return, just let me know.
感谢你所做的一切,如果你需要我帮忙的话,尽管开口吧。
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。