很多动物进化出了明确表述玩耍的信号。
Many species have evolved clear signals to delineate playfulness.
她可能是在成年蛾刚从蛹中孵化出来时观察到的。
She may have observed the adult moth just as it emerged from its pupa.
即使鳄鱼成功地从卵中孵化出来，问题也不会结束。
The problems do not end if crocodiles successfully hatch from the eggs.
我们进化出了大量出汗的能力，并且失去了大部分的皮毛。
We evolved the ability to sweat plentifully, and lost most of our fur.
一些学者认为人类和猿的分化出现在一千五百万到两千万年前。
The split between humans and living apes is thought by some scholars to have occurred 15 to 20 million years ago.
这一变化出现的一个原因是人们越来越重视对人类的历史研究。
One reason for this change was the increasing emphasis given to the historical approach to man.
那么，为什么动物会进化出一种似乎会危及它们自身的特性呢？
So why would animals evolve a characteristic that seems to endanger them?
现在你拥有了一些几乎一孵化出来就相当成熟、相当能干的鸟儿。
Now you have some birds that are quiet mature, quite capable, almost as soon as they hatch.
“大脑需要具备一定的复杂性和容量，才能进化出意识。”他补充说。
"For consciousness to evolve, a brain with a threshold level of complexity and capacity is required," he added.
一种完全无毒的蛇家族，王蛇，也进化出了能中和响尾蛇毒液的血清。
One family of completely harmless snakes, the kingsnake, has also evolved serum that neutralizes rattlesnake venom.
和动物一样，人类进化出了一套复杂的机制，来处理有关潜在威胁的信息。
Like animals, humans evolved with an elaborate mechanism for processing information about potential threats.
研究人员发现毒液甚至在蛇出现之前就已经进化出来了，大约在一亿年前。
The researchers found that venom evolved before snakes even existed, about a hundred million years before.
生活在沙漠中的大型动物已经进化出许多适应能力，以减少极端高温的影响。
Large animals that inhabit the desert have evolved a number of adaptations for reducing the effects of extreme heat.
直到大约1000万年后，鲸类才进化出专门的肾脏，使它们能够饮用盐水。
Not until about ten million years later did species of whales develop specialized kidneys enabling them to drink salt water.
欧洲书籍最大的变化出现在1439年，当年约翰内斯·古腾堡发明了印刷机。
The biggest change for books in Europe came in 1439, when Johannes Gutenberg invented the printing press.
维纳斯捕蝇草似乎已经进化出了这种捕蝇草的更复杂的版本，包括颚状的叶子。
Venus flytraps appear to have evolved an even more elaborate version of this kind of trap, complete with jaw-like leaves.
然而，他们虽然仍呼吸着空气，却从未进化出类似于腮这种早期海洋生物的器官。
They do, however, still breathe air, having never developed anything equivalent to the gills of their earlier marine incarnation.
麻斑海豹进化出的母性策略可能与它们的小体型和哺乳时消耗掉的大部分脂肪有关。
The maternal strategy evolved by harbor seals may have to do with their small size and the large proportion of their fat stores depleted in lactation.
古老的淡水绿藻一定进化出了一些特性，这些特性使得它们能够熬过极端的温度和干旱期。
Ancient fresh water green algae must have evolved features that enable them to withstand extremes of temperature and periods of dryness.
根据化石记录，我们可以更准确地判断出：人类可能在大约150万年前进化出了裸露的皮肤。
We can make a very good estimate from the fossil record that humans probably evolved naked skin around a million and a half years ago.
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