但与海豚实验不同的是，猴子们必须完成四项实验才能得到反馈。

But unlike in the dolphin experiment, the monkeys had to complete four trials before they got any feedback.

youdao

但与海豚实验不同的是，猴子们必须完成四项实验才能得到反馈。

But unlike in the dolphin experiment, the monkeys had to complete four trials before they got any feedback.

youdao