浏览一个装饰好的节日橱窗或寻获一件市面上少见的玩具似乎会开启大脑的反映中心，刺激大脑化学物质的释放，使你达到购物的兴奋状态。

Peering into a decorated holiday window or finding a hard-to-find toy appears to tap into the brain's reward center, triggering the release of brain chemicals that give you a shopping high.

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这会让燕子处于高度兴奋状态，刺激它们分泌更多的唾液，筑成售价昂贵的燕窝。

This keeps the birds in a state of high excitement, which in turn spurs them to produce more of the saliva which they use to make their prized nests.

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这会让燕子处于高度兴奋状态，刺激它们分泌更多的唾液，筑成售价昂贵的燕窝。

This keeps the birds in a state of high excitement, which in turn spurs them to produce more of the saliva which they use to make their prized nests.

youdao