我们可以用一个球作为奖励，来说明积极的狗和消极的狗之间的不同。

We can use a ball reward to demonstrate the difference between active and reactive dogs.

youdao

我们可以用一个球作为奖励，来说明积极的狗和消极的狗之间的不同。

We can use a ball reward to demonstrate the difference between active and reactive dogs.

youdao