Some ethicists regard the cloning of humans as a morally unjustifiable intrusion into human life.
一些伦理学家把克隆人类看作是对人类生活道德上的入侵.
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Scientists have long used sea urchins to study fertilization and early development in humans.
科学家们一直用海胆来研究受精卵和人类早期形态.
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They were uninterested in attacking humans, even in the name of fame.
他们对攻击人没有兴趣, 即使这样做是关乎名誉.
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Earth has become uninhabitable and the surviving humans are fleeing to Mars.
地球已经变得无法居住,幸存的人纷纷逃离至火星.
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Many diseases that could harm humans may be both undetectable and harmless in their natural hosts.
许多对人体有害的疾病在它们天然的寄生体中可能既不易被察觉又是无害的.
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但是, 由于种间组织免疫系统之相互排异反应,从前那些用未经改良之猪器官做之移植试验都失败了.
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Penguins don't have any land predators, which may explain why they are usually unafraid of humans.
企鹅在陆地上没有掠食者, 这也许可以解释为甚麽它们通常不怕人类.
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Goose bumps are a vestige from the days when humans were covered with hair.
鸡皮疙瘩是人类全身为毛发覆盖时候的退化器官.
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The lives of the earliest humans were already vastly differ-ent from those of other animals.
这些早期的人类的生活,已经大大有别于动物.
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Vaccinia doesn't cause diseases in humans, but it has helped us fight them.
痘苗病毒在人类中不会引起疾病, 相反它曾帮助我们对抗疾病.
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With the exception of humans, species are important but individuals are not.
除人类以外, 种群比个体来得重要.
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Habitats provide humans with services such as water treatment , pollination and sediment capture.
生态环境给人类提供了诸如水资源 、 授粉物质以及沉淀物质的服务.
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Newborn werewolves simply appear to be normal humans or wolves in almost every respect.
新生的狼人在任何方面看来表现都与普通的人或狼一样.
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