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.
因为在美国没有天敌，它们数量暴增。
With no natural predators in America, the bugs' population is soaring.
就如许多引进的物种一样，美国貂也能通过生态系统杀出一片生机，因为它们没有本土的天敌，而它们所掠食的物种还没有进化到可以躲避它们的掠食。
Like many introduced species, American mink can slash their way through the ecosystem, as they have no native predators, and their prey species haven't evolved to avoid them.
布兰·卡多表示，由于臭鼬在自然界没有任何天敌，它们的数量就会增加到很多。
Brancato says skunk populations can grow large because they don't really have any natural predators.
因为这种特别的昆虫是入侵生物，所以它们本身在当地没有天敌，没有能有效控制它们数量的天敌。
And so this particular insect, because it is an invasive, it has no native natural enemies per se. It has no natural enemies that are really very effective at controlling populations of this insect.
这种兔子在澳大利亚没有天敌，所以它们繁殖得很快。
This rabbit had no natural enemies in Australia, so it multiplied rapidly.
它们没有办法抵御天敌。
它们的具体数量尚不清楚，目前也不属濒危动物，也没有天敌。
Their population Numbers are unknown, and they do not currently appear on any lists of endangered or vulnerable animals.
因为它们没有任何捕食天敌，所以他们有很高的存活率。
Since they don't have any predators, they have a high survival rate.
因为它们没有任何捕食天敌，所以他们有很高的存活率。
Since they don't have any predators, they have a high survival rate.
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