麋鹿穿过冬天的冰雪，到达苏必利尔湖的皇家岛，在那里，它们没有天敌，自由繁殖。
Moose reached Isle Royale in Lake Superior by crossing over winter ice and multiplied freely there in isolation without predators.
在当地它们没有天敌，也没有生物想要捕食它们。
They have no native predators, no creatures that like to feed on them.
没有天敌的大象必须在广袤的大地上四处漫游，才能解决它们每日的口粮问题——52加仑合200公升水及约300公斤合660磅的草、树叶及树枝。
Elephants, which have no predators, must roam widely to get their daily ration of as much as 52 gallons (200 litres) of water and about 300 kilograms (660 pounds) of grass, leaves and twigs.
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