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。
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.
他们在码头旁钓鱼，因为这里的浅水处有一大群银光闪闪的鲭，这些鱼以那些在码头的框架大梁上垂下来的葬礼杂草为生。
They fish by it, because the silver-flicking mackerel come there in dense shoals, feeding on the funeral weeds that hang among the girders.
一只有毒的狮子鱼闯进了一大群游在一起的小鱼中间。
A venomous lionfish breaks into a huge ball of swirling baitfish.
但这时一大群水虎鱼在享用这顿大餐。
但这时一大群水虎鱼在享用这顿大餐。
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