当它听到主人说“YES”的时候它感到舒服，它变得喜悦，它知道训练结束了，它将要得到奖励。
When he hears his handler say "YES" he feels good, he gets excited, he knows the exercise is over and he is going to get a reward.
当它听到主人说“YES”的时候它感到舒服，它变得喜悦，它知道训练结束了，它将要得到奖励。
When he hears his handler say "YES" he feels good, he gets excited, he knows the exercise is over and he is going to get a reward.
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