Yes, we have done a little. But we have just started and have nothing to show you.
有,我们做了一些,但是因为我们才刚起步,并没有任何资料可以提供给你们。
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。