But that is unproven, and would be a strike against evolution because, in nature, the umbilicus of a mammal usually does remain attached to the infant for some time after birth.
但是，这个论据是未经证实的，而且也有违进化论。因为，自然中，普通动物在分娩后，脐带还会与婴儿连接一段时间。
This is a classic trade-off in language evolution: weighing the benefits of improving the language in an obvious way against the unknown risk of breaking some (possibly weird) programs.
在语言演变中这是一个经典的权衡：即以明显的方式改进语言的优势与破坏一些(可能很奇怪的)程序的未知风险之间进行权衡。
There, under a sun that never sets, they anchor tents against freezing winds, post lookouts for polar bears, and begin coaxing the secrets of evolution from a rocky polar desert.
在那个极昼之地，他们在刺骨的寒风中固定好帐篷，设置好警戒北极熊的岗哨，然后从布满岩石的极地荒原中开始慢慢探寻进化的奥秘。
One theory is that, over millennia of evolution, our immune systems got used to worms. So if you take them away, the immune system runs wild, as it has nothing to work against.
有推测说，经过几千年的进化，我们身体的免疫系统已经习惯了蠕虫的存在，所以如果去除它们，免疫系统就会因没有对抗物而失控。
After several generations of evolution (degradation), these birds can not know many birds fly, because once again appeared predators but unable to escape or against extinction.
经过数代的进化(退化)，这些鸟类已经不再会飞翔，很多鸟类因为再次出现了天敌却无力逃生或对抗而灭绝。
We compared this with evolution against a fixed target, by disabling the bacteria's ability to adapt to the virus.
我们还比较了这一点在进化遇到一个固定靶标时的情况，如使细菌的适应机制失效”。
It is possible that these viruses have had an important role in the evolution of human defences against disease.
这些病毒对人类疾病防御的进化具有重要作用是可能的。
Through the application of the industrial structure theories at home and abroad, this thesis studies industrial structure evolution and updating against the background of network economy for China.
通过运用国内外产业结构的相关理论，针对“网络经济环境下我国产业结构的演化与升级”这一问题展开研究。
He described the evolution of resistance in Tetranychus against tetraethyl pyrophate.
他叙述了恙虫对焦磷酸四乙脂的抗性进化。
When evolution selects its agents, it does so at a cost. It makes demands in exchange for singularity. And you may be asked, to do something, against your very nature.
当进化决定了它的代理人，它就要求获得对价，它会要求很特别的东西来做交换，你也许会被迫做一些违背自己天性的事。
Inbreeding depression is the decrease of offspring fitness after inbreeding and is one of the primary forces selecting against the evolution of self-fertilization.
近交衰退指近交个体的适合度相对下降的现象，它是近亲繁殖的主要障碍。
Inbreeding depression is the decrease of offspring fitness after inbreeding and is one of the primary forces selecting against the evolution of self-fertilization.
近交衰退指近交个体的适合度相对下降的现象，它是近亲繁殖的主要障碍。
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