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1·So it is a comparatively simple step from locating the sea bottom to locating a shoal of fish.

所以相比较测量海底，定位鱼群是类似的步骤。

2·A birdwatcher can never fly with a flock of migrating birds, but a diver can loiter in a shoal of fish.

因为即便是观鸟者也无法与鸟儿一同飞翔，但潜水者却可以和鱼儿共同在水中畅游。

3·A shoal of fish will do this. So it is a comparatively simple step from locating the sea bottom to locating a shoal of fish.

一大群鱼也是这样，所以，根据海底位置来判断大群鱼的位置也就相对简单了。

4·The shark described a circle around the shoal of fish.

这条鲨鱼围绕着鱼群游动。《牛津词典》

5·With experience, and with improved apparatus, 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.

根据经验和改进了的仪器，人们不仅能确定鱼群的位置，还可以根据鱼群回声的特点辨别鲱鱼、鳕鱼还是其他人们熟知的鱼种。

6·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.

不仅有可能测定鱼群的位置，而且可以根据鱼群回声的图象区分出鲱鱼，鳕鱼或其他人们所熟悉的鱼。