他们的天敌已被灭绝。
大树的特殊天敌是昆虫和树木疾病。
一些人建议引入鹿的天敌，如狼、狮子和熊，到鹿过多的地区。
Some suggest bringing in natural enemies of deer, such as wolves, lions and bears, to areas with too many deer.
阻止蕨菜蔓延的一种潜在的廉价和自我维持的方法是引入该植物的天敌。
One potentially cheap and self-sustaining method of halting the spread of bracken is to introduce natural enemies of the plant.
有些鱼和蜗牛以海星为食，特别是巨型法螺蜗牛，它是海星的主要天敌。
There are fish and snails that eat starfish, particularly the giant triton snail, which is the main predator of the starfish.
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.
由于没有天敌，又有大片绿色的郊区禁止捕猎，野生动物官员估计，新泽西鹿的数量已经超过17.5万只。
With no natural predators and expanses of green suburban neighborhoods that allow no hunting, wildlife officials estimate the New Jersey deer population to have grown to exceed 175,000.
没有天敌的大象必须在广袤的大地上四处漫游，才能获得每日约300公斤（合660磅）的草、树叶及树的口粮。
Elephants, which have no predators, must roam widely to get their daily ration of about 300 kilograms (660 pounds) of grass, leaves, and twig.
这种黄色的花是昆虫的天敌。
任何气味都可能引来试图吃掉熊猫宝宝的天敌。
Any smell might attract natural enemies that would try to eat the little panda.
他最大的梦想是找到一个最好的池塘，在里面自由地游泳，而不用担心他的天敌——水蛇。
His biggest dream was to find the best pond to swim in freely without worrying about water snakes, which were his natural enemies.
天敌包括捕食性天敌与寄生性天敌。
The natural enemies include predacity and parasitical enemy.
长角甲虫幼虫的部分在寻找天敌的天敌中起着重要的作用。
Frass of long-horned beetle larvae plays an important role in natural enemies searching for their cerambycid hosts.
淡水河豚没有天敌，除了人类。
顺从和社会认可是心灵自由的天敌。
Conformity and social acceptability is the natural enemy of the free mind.
储存衣服的天敌是吃衣物的虫子。
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.
是昆虫的天敌，人类的朋友。
家猫被视为入侵物种且几乎没有天敌。
they are regarded as an invasive species and have few natural enemies to check their numbers.
这些由当地人引进的入侵物种没有天敌。
These invasive species – brought to the island by people – have no natural predators.
而且，要是没有天敌，也没必要用鸡笼。
And if there are no predators, there's really no need for a coop.
优柔寡断是行动的天敌。
它的天敌是足够的练习。
男女两性从来不是天敌，而是平等的伙伴。
你往哪儿去逃避天敌？
还是为了吓唬天敌？
河马几乎没有天敌。
可口可乐是铁锈的“天敌”。
他们对捕食数百万幼小牡蛎的动物天敌也所知无几。
And they knew little about the predators that attack and eat baby oysters by the millions.
他们对捕食数百万幼小牡蛎的动物天敌也所知无几。
And they knew little about the predators that attack and eat baby oysters by the millions.
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