Though people of two countries cannot go across the border without permission, animals, however, can cross the border freely.
虽然两国人民未经许可不能越过边境，但动物可以自由跨过边境。
For wild animals that cannot be returned to their natural habitats, zoos offer the best alternative.
对于无法放归自然栖息地的野生动物来说，动物园是最好的选择。
It has proved toxic at some doses in animals and so cannot be used in humans.
一定剂量的苯丙胺是确证对动物有毒的，因此不能用于人类。
You cannot spend time with all four kinds of sea animals in one tour.
您不可能在一次旅行中同时看到四种海洋动物。
But humans can at least give verbal expression to their loving feelings; so far, animals cannot, although there is the potential for Revelations from language-taught great apes.
但是人类至少可以用口头表达他们的爱情感受；到目前动物们还不能，尽管有类人猿展现了可以学会语言的潜力。
What keeps this vast system clean is a web of earth, plants and animals; when water cannot be in touch with these it is no longer a sustainable and healthy system.
而能保持这一庞大水系统洁净的则是由泥土、植物、动物组成的网络。当水不接触它们时，这个系统就不能再保持正常了。
You cannot share your life with a dog, as I had done in Bournemouth, or a cat, and not know perfectly well that animals have personalities and minds and feelings.
你不能像我在伯恩茅斯那样和狗或猫一样的生活，也不能完全知道动物是否有性格，思想和情感。
It has always been assumed that plant viruses cannot infect animals, and vice versa, but plant viruses are known to be abundant in human faeces.
过去一向以为植物病毒不能感染动物，反之亦然，但是植物病毒却被发现在人类粪便中大量存在。
Humans cannot morally own each other, nor can they "morally" own animals; humans are simply caretakers of the animals.
人类在道义上不能彼此拥有，因此“在道义上”也不可以拥有动物；人类只是动物的看护人。
The forms of communication that animals use are much more limited-they can express a desire to mate, or warn of the approach of a predator, but those calls cannot be combined to mean something new.
动物采用的交流形式非常有限，他们能发出求偶信号，或者入侵警报，但是那些信号不能被组合起来表达其它新含义。
As a consequence, the animals of the Antarctic continental shelf have been free for millions of years from the attentions of predators, such as crabs and sharks, that cannot cope with the cold.
因此，在不能适应寒冷的肉食动物如海蟹、鲨鱼的关注下，南极大陆上的动物已经自由自在了几百万年。
Others, such as nitrous-oxide emissions fromsoils and methane emissions from animals, cannot.
而另外一些却不能直接检测，比如从土壤中排放的一氧化二氮与从牲口身上排放的沼气。
However, their contributions cannot be underestimated, considering the inherent metabolic efficiency of the large animals.
然而，考虑到大型动物先天的新陈代谢效率，其贡献不可低估。
"We will make clear that certain products cannot be used on smaller animals," Owens said.
“我们将明确指出，某些产品不能在小动物上使用”欧文斯说。
I cannot remember a time when I did not want to go to Africa to study animals.
我甚至都想不出我有那一点点时间不愿意去非洲研究动物。
Such algal blooms are not only harmful to people and animals but can also trigger dead zones in the lake-areas in the water so devoid of oxygen that they cannot support aerobic life.
这种水藻大爆发不仅会对人畜造成危害还会在湖水中制造死亡区域——水中的一片区域会因为氧气匮乏而完全不能供有氧生物生存。
Some people cannot accept the idea that animals might have intelligence so that they are even more surprised at the suggestion that machine might.
有些人不能接受动物可能有智力的想法，因此，他们对机器可能有智力的设想就更加惊讶。(结果)。
Understand that one cannot consume the flesh of these animals or one will break all agreements for the nature kingdoms to ascend their biology.
请理解到，你不能食用这些动物的肉，否则你将打破提升自然界生物形态的协议。
As Darwin wrote in an 1838 notebook, "I cannot help thinking good analogy might be traced between relationship of all men now living &the classification of animals."
达尔文在1838年的日记中写道：“我禁不住认为在人类关系和动物分类方面可以追踪到相通之处。”
Plants and animals also cannot ascend with human grid work woven in, as human grid work will not conduct the appropriate set of genetic instructions into their physical form.
植物动物，也不能用被编织进来的人类晶格层提升，因为人类晶格层并不会将合适的遗传引导到它们身体。
Compassion for animals is intimately connected with goodness of character, and it may be confidently asserted that he, who is cruel to living creatures, cannot be a good man.
对动物的同情与善良的性格关系密切，而他可以肯定地断言，残暴地对待生灵的人，不会是一个好人。
If the animals cannot find enough plants to eat, they will starve or have to leave the place.
要是那些动物找不到足够的植物吃，它们就会饿死或被迫离开那地方。
Informed that you have a vacancy for a student to serve as the spokesman for animals, I cannot resist my inner excitement, hoping to seize the opportunity to do something for animals.
得知你们有一个空缺给学生充当动物发言人，我抑制不住内心的激动，想要抓住这次机会为动物做些什么。
Easier farming was once the chief way of live in nearly every country, people cannot live without food, and nearly all their food comes from crops and animals raised on farms.
简单农业曾经几乎是，是世界上每一个国家的主要生活方式，人没有粮食就不能生存，而且几乎人们所有的食品都来自农作物和家畜。
Several species of birds, reptiles and animals exist here that cannot exist elsewhere in the known world.
鸟类，爬行动物和动物物种存在的若干这里不能存在于已知世界其他地方。
Several species of birds, reptiles and animals exist here that cannot exist elsewhere in the known world.
鸟类，爬行动物和动物物种存在的若干这里不能存在于已知世界其他地方。
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