实验开始之前，所有狗都知道猫。
All of them knew what a cat was before the experiment began.
在他的实验中，他把两个有盖的箱子放在几只狗的面前，其中一个箱子里放着食物，另个则空空如也。
In his experiment, dogs were shown two covered containers. One held a treat.
生物学家曾经做过实验，将一条有孤僻症的狗放在屋里，然后主人离开。
Biologists have done experiments, will be an autism dog inside, and then leave the owner.
这是个寒冷、刮着风的夜晚，实验室外有只狗在嚎叫。
The night is cold and windy. Outside the laboratory a dog howls.
实验组有一只狗出现菌血症。
实验组有一只狗出现菌血症。
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