它们很小，可以轻易地溜进你的房子里，成群地生活，数量从几万到几十万，迅速繁殖。

They are small enough to easily slip inside your house, live in colonies that number in the tens of thousands to the hundreds of thousands, and reproduce quickly.

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事实证明，生活在溪边栖息地的鸟对数量是远离溪边栖息地的四倍。

It turned out that there were actually four times as many bird pairs or couples living in the stream edge habitat compared to the area away from the stream.

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然而，在海底热液喷口附近，也就是温暖海水从地下涌出的地方，生活着大蛤、盲蟹和鱼类，数量非常庞大。

However, near hydrothermal vents, areas of the ocean where warm water emerges from subterranean sources, live remarkable densities of huge clams, blind crabs, and fish.

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Now these parts of the world are shrinking in the number; but let's say you lived in Ethiopia or Somalia, or places where food really is scarce way too much of the time, then having this particular biological drive, having a brain that wants you to seek out these foods would be highly adaptive.

现在这些地区的数量正在减少,但如果你生活在埃塞俄比亚或是索马里,或是当前食品十分短缺的地区,那么拥有这种生物驱动力,拥有不断驱使你去寻找食物的大脑,会让你有极强的适应能力

耶鲁公开课 - 关于食物的心理学、生物学和政治学课程节选