对于这一事件没有确定的解释，但推测人类的繁殖与温度和季节有密切关系。
No firm explanation has been put forward for this, but speculation is that human reproduction is linked to temperature and season.
研究人员写道：“寻找和搜集的改进'最终可能解释为什么人类的繁殖率不一样'”。
Improvements in hunting and gathering "may ultimately explain why human reproductive rates diverged," the researchers wrote.
她指出，人类一直试图加强配偶之间的联系，最大限度地提高繁殖成功率。
She suggests that humans have always tried to strengthen the pair bond to maximise reproductive success.
有人认为，如果环境能够支持熊的繁殖，那么就有足够的食物资源来支持人类。
It has been suggested that if the environment were capable of supporting breeding populations of bears, there would have been enough food resources to support humans.
像许多有性繁殖的物种一样，人类有特殊的性染色体。
Like many sexually reproducing species, humans have special gonosomes.
一位认知科学家，大卫基尔，其报告指出，由于人类社会的进步越来越复杂，个人并不需要有那些为了生存和繁殖的智力。
One cognitive scientist, David Geary, argues that as human society grows increasingly complex, individuals don't need to be as intelligent in order to survive and reproduce.
因为自然选择比起健康而言更喜欢繁殖，生物的演化远不及的微生物的繁殖，病原体的进化远远快于人类。
Because natural selection favors reproduction over health, biology evolves more slowly than culture, and pathogens evolve more quickly than humans.
不管结果如何，人类复杂的繁殖过程总是让人惊叹不已。更奇妙的是，这种无比复杂的过程还总能结出硕果。
Whatever the ultimate outcome, it never ceases to amaze me how complicated human reproduction is - and that it often actually works!
它也暗示着，如果尼安德特人和现代人种有任何的杂交繁殖，所产生的都是琐屑的东西，同时不会表现在现代人类中。
It suggests, too, that if there was any interbreeding between Neanderthals and modern humans, this was trivial and is not represented in the modern human population.
然而它们却从不救助幼崽，以人类的理解，这是因为失去幼崽比失去具备繁殖能力的狼要好。
However, they never save cubs from humans understanding that it's better to be deprived of a new generation than of a breeder.
狗狗们经常被过度繁殖，极不卫生的拥挤在一起，也没有和人类的社交训练。
Dogs are often bred far too frequently, are kept cramped together in squalor, and are not socialized with humans.
对人类而言，就像对大多数动物物种那样，雌性的身体状态对繁殖的成功非常重要。
In humans, as in most animal species, the state of the female body is very important for the success of reproduction.
我们不得不怀疑，他试图与这些高智能种族结合是想通过繁殖来消除人类根深蒂固的愚蠢。
We imagine that he was trying to mate with more intelligent species in the hope of breeding out humanity's native stupidity.
这一章详细探讨了反重力环境可能对行经和繁殖能力造成的影响，也谈到了在火星上诞生人类婴孩的意义。
The chapter details the possible effects of anti-gravity on menstruation and fertility, as well as the significance of a child born on Mars.
人类中心温度无法适应它们繁殖，即使袭击人类时通常也是在较冷的四肢。
It can't thrive at a human's core temperature, which is why it only attacks our cooler extremities.
原因就是，人类女性对自己的生育繁殖能力一直有隐藏的动机，而其他种类的动物则恰恰相反。
That's because women have a strong motivation to hide the fact that they're fertile, unlike other members of the animal kingdom.
他们创造了一个自我维系和自我繁殖的生态系统，让阿森松岛更适合人类居住。
They created a self-sustaining and self-reproducing ecosystem in order to make Ascension Island more habitable.
与少量尼安德特人DNA的第一次比对并没有发现任何杂交的迹象，人类和他们不存在异种繁殖也成为了一种被广泛接受的结论。
The first comparisons of small sections of Neanderthal DNA did not indicate any hybridization, and the lack of interbreeding became a widely accepted conclusion.
如果生物链的一头断了，那么另一种动物就会大肆繁殖，甚至威胁到人类，大家记住保护动物。
If a broken food chain, then another will wantonly breeding animals, and even a threat to humanity, we bear in mind the protection of animals.
科学家本周五说，由于人类的过度捕杀，海洋中食肉性的大型鱼类越来越少，在过去一百年里只剩下小型鱼成倍繁殖。
Fewer big, predatory fish are swimming in the world's oceans because of overfishing by humans, leaving smaller fish to thrive and double in force over the past 100 years, scientists said Friday.
虽然黑猩猩是500万年前近亲繁殖而成并导致人类出现的团伙，但是任何同物种间的相似迹象都很有趣。
Signs of anything similar in a species that, albeit a close-ish relative, parted company from the line leading to humans at least 5m years ago are therefore interesting.
当然，这种文字化的亲生命性（biophilia）（这是威尔逊创造出来的一个新词，指的是人类与生俱来的与其他生物间的情感纽带——译者注）不太可能让我的繁殖潜力得到再次增强，但却着实充实了我的整个夏天。
It isn't obvious that this literary biophilia – the word is Wilson's own coinage – somehow enhances my chances of reproductive survival, but it certainly enhanced my summer.
他宣布自己反对使用这种非同寻常的畜牧繁殖技术来克隆人类，并下令。
Declaring that he was opposed to using this unusual animal husbandry.
“我想有些人认为这不怎么重要的原因，就是在社会生物学的观点看来，不管在什么时候，只要能成功生育和繁殖下一代就行了。”东卡罗莱纳大学人类学系的学科带头人琳达·沃芙如是说。
everything had to be tied to reproduction and reproductive success," said Linda Wolfe, who heads the Department of Anthropology at East Carolina University.
“我想有些人认为这不怎么重要的原因，就是在社会生物学的观点看来，不管在什么时候，只要能成功生育和繁殖下一代就行了。”东卡罗莱纳大学人类学系的学科带头人琳达·沃芙如是说。
everything had to be tied to reproduction and reproductive success," said Linda Wolfe, who heads the Department of Anthropology at East Carolina University.
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