And plus, if you are not completely satisfied, you can return it to us.
并且,如果您不是百分百的满意,你可以将产品退还给我们。
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。