1. 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。

2. When Canada took similar measures to protect the supply of herring in the 1970s, the fish eventually recovered.
    加拿大在20世纪70年代也曾采过取类似措施来保护鲱鱼的数量，最终鲱鱼的数量得到了恢复。

3. Don´t draw a red herring across the track.
    不要转移别人对主要问题的注意力。