含有丰富碳水化合物的食物刺激大脑释放一种叫做血清素的化学物质血清素，可调节情绪，促进进食和睡眠。

Carb-rich foods stimulate the release of a brain chemical called serotonin that regulates mood, food cravings, and sleep.

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食物的呈现是为了刺激你的食欲。

The presentation of the food is designed to stimulate your appetite.

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根据康奈尔大学食品与品牌实验室的一项新研究，小小的非食品奖励——比如麦当劳开心乐园餐中的玩具——同样能刺激人的大脑反应中枢，就像食物那样。

According to a new study from Cornell University's Food and Brand Lab, small non-food rewards—like the toys in McDonald's Happy Meals—stimulate the same reward centers in the brain as food does.

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So, what happens is the UCS and the CS, the bell and the food, go together because they happen at the same time.

发生的事情不过是,无条件刺激与条件刺激，铃声与食物，因为恰巧同时出现而联系在了一起。

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Well, when Pavlov, for instance, started before conditioning there was simply an unconditioned stimulus, the food in the mouth, and an unconditioned response, saliva.

比如，在条件作用形成之前,只是简单的存在着无条件刺激，即食物，以及无条件反应，即唾液。

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