想象这头猪戴着很重的项圈，作为对这头猪向前走的奖励，你可以把沉重的项圈拿掉。

Imagine that the pig has a heavy collar and to reward the pig for walking forward, you might remove the heavy collar.

youdao

我的手托着他的胳膊引导着他，但是他向前走得很稳健，双肩平直，头昂得很高，好像在引导着我。

My hand cupped his elbow to steer him, but he stepped forward unfalteringly, his shoulders squared, his head high, as though he were guiding me.

youdao

该肌腱形似绳索，一头连着小腿的腓肠肌和比目鱼肌，另一头与跟骨相连，在人体行走，跳跃或跑动时，行成向前的推力。

The rope-like tendon connects the calf muscles, the gastrocnemius and the soleus, to the heel bone, and is responsible for pushing off when you walk, jump or run.

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So, imagine the pig has a heavy collar and to reward the pig for walking forward you might remove the heavy collar.

所以，想象这头猪带着很重的项圈,作为对这头猪向前走的奖励,你可以把项圈拿掉。

耶鲁公开课 - 心理学导论课程节选

And if you do that over the fullness of time, your reinforcement and punishment will give rise to a pig who walks forward.

如果你长时间的这么做，你的强化和惩罚,就会使这头猪形成向前走的行为。

耶鲁公开课 - 心理学导论课程节选

So, you reinforce the pig for walking forward and you punish the pig for walking backward.

那你就对这头猪向前走的行为给予强化,如果它向后退，你就惩罚它。

耶鲁公开课 - 心理学导论课程节选