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.

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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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保持你的头和肩膀平齐，不要向前伸你的脖子。

Keep your head aligned over shoulders; don't stretch your neck forward.

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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