Supposedly, it's a gene passed down from our prehistoric ancestors who could eat a lot and build up reserves of fat to survive frequent famines.

假设，我们的祖先食量很大，并且可以积聚脂肪来渡过频繁发生的饥荒。

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They arrive exhausted and Mai Po, however well protected from fishermen and foreshoremen, lacks the food resources to allow so many birds to build up reserves of fat for their onward migration.

它们来到这里已经是精疲力尽了，尽管米埔被渔民保护得很好，但是仍不足以为如此多的鸟在迁徙中补充体力提供食物。

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In the western portion of the bay, the ice begins to melt in late spring. The polar bears then go into hibernation, living off reserves of body fat until the sea freezes again.

在哈德逊湾的西部地区，冰雪在晚春就会开始融化，此时北极熊将进入夏眠，以消耗自身存储的脂肪为生，直到海面再次结冰。

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