First of all, he kept the two dolphins together in the same tank and taught them to press levers whenever they saw a light.
首先，他把两只海豚放在同一个水箱里，教它们无论什么时候看到光就按控制杆。
The fish were placed in a tank with two feeders, one of which supplied a lot more food than the other, known as the "rich feeder".
这些鱼被安置在一个有两个喂食器的鱼缸里，其中一个喂食器提供的食物比另一个多得多，被称为“富庶喂食器”。
In contrast, when juvenile lobsters were reared in a smooth tank without the oyster chips, the majority developed two cutter claws.
相比之下，当幼龙虾在没有牡蛎片的光滑鱼缸中饲养时，大多数都发育出了两个刀爪。
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