Meanwhile, the deadliest strains of the virus perished with their hosts as natural selection favored strains that could infect hosts but not kill them.
同时，由于自然选择更倾向于选择那些能够感染宿主但不致其死亡的病毒，这种致命病毒便随着宿主的死亡而消失。
There is, first, the New York of the man or woman who was born here, who takes the city for granted and accepts its size and its turbulence as natural and inevitable.
首先是纽约这座城市，在这里出生的男男女女们认为这座城市的存在是理所当然的，认为城市的规模和动荡都是自然形成的，是必定会发生的事情。
That there's a picture of a missel thrush on her nest, as large as life an twice as natural.
这画的是一只画眉鸟在她的窝里，身形跟真的一样大，但模样比真的还要生动。
I wanted to embrace it all and to become as natural in this environment as possible.
我想拥抱这个国家，在陌生的环境下，我总是尽量让自己表现得自然一点。
Reefs also play a crucial role as natural breakwaters, protecting coastlines from storms.
礁石的另一个重要作用是它可以充当天然的防洪堤，使海岸线免受风暴侵袭。
As you can see, iterating over a Map is just as natural as iterating over any other collection.
可以看到，迭代Map和迭代其它任何集合一样自然。
Blood rubies: Burma exports only a handful of products, such as natural gas, wood, and gems.
血红宝石：缅甸出口的产品屈指可数，只有天然气，木材和宝石。
Coal typically produces almost twice as much carbon dioxide per kilowatt-hour as natural gas.
通常来讲，煤生产每千瓦时产出的二氧化碳约为天然气的两倍。
We accept the ups and downs of life as natural events that can be used as lessons for our growth.
正视生活中的坎坷，把它当做成长中的教训。
I usually use strobes on my location shoots, but I want to keep it as natural looking as possible.
我通常是在我的拍摄位置摆放闪光灯，但是这次我想让照片看起来更自然一点。
The genes in question control a type of white blood cell known as natural killer cells, or NK cells.
斯坦福大学的研究者们提出的这项假设发人深思，甚至出人意料。 他们所说的基因控制了一种被称为自然杀手细胞(NK细胞）的白血球细胞。
The purpose of a breath prayer is to say it so often that it becomes as natural and unconscious as our breath.
呼吸式祈祷的目的就是让祷告像呼吸一样成为一种很自然的下意识行为，就是因为这样的祷告是一直在对神诉说不停的。
Learn to incorporate the following things in your life and you might find that luck becomes as natural as breath.
尝试着去做下列事情，你会发现获得好运气就好像呼吸一样简单。
Networking: Windows 7 still isn't quite as natural at networking as I find the Mac to be, but it's better than Vista.
联网：我发现Windows7仍没有Mac的联网自然，不过比Vista要好。
The living room is toplit as natural light enters between the diagonal outside wall and the inside vertical surface.
客厅通过顶部采光，从倾斜的外墙和内部的垂直面之间透进自然光。
The radiation comes from space (cosmic rays) as well as natural radioactive materials found in the soil, water and air.
辐射来自于外层空间（宇宙射线），以及在土壤，水和空气中的天然放射性物质。
Robert is a hubristic scientist, a man questioning the nature of what we have traditionally been taught to regard as natural.
罗伯特是一位傲慢的科学家，我们一直以来所灌输的“自然”的观点遭到他的质疑。
After you have reached your first goal think of the next one and in a few months at home workouts will be as natural as breathing.
在你完成第一个目标后考虑下一个目标那么在几个月里在家里健身将变得像呼吸一样自然了。
Search agency Greenlight recently extended its regular analysis of search visibility to cover paid as well as natural-search.
Greenlight最近将针对搜索能见度的定期分析，延伸至涵盖了付费搜索和自然搜索范畴。
But over the past decade, third-generation artificial turfs that perform every bit as well as natural grasses have begun to sprout.
但是在过去十年中，第三代人工草皮凭借其像天然草皮一样的表现开始崭露头角。
Forest canopies serve as natural buffers against wind and rain, and the deep roots of trees help keep the granular soil from shifting.
森林的树冠作为自然缓冲，抵挡着风和雨的侵袭，而树木的深根也防止了水土流失。
For a time, it was successful, but then evolution struck back, as natural selection favoured the spread of insecticide-resistant genes.
这种方法一时间非常有效，但接着蚊子重磅回击——大自然的生存法则让蚊子大军有了抗杀虫剂的良好基因。
So failure is not defeat; he will continue to teach you — and stretch you — until walking by faith and not by sight is as natural as breathing.
失败不是一切，他将会继续教导你，帮助你，直到你是凭信心而不是凭眼见而行，就像呼吸一样自然。
He coined the term "Pattern language" to express his conviction that people's ability to design is as natural as their ability to use a language.
他提出了术语“模式语言”，以此代表他认为人类进行设计的能力和使用语言的能力都是天生的这一信念。
Sixty years after the publication of Orwell's masterpiece, Nineteen Eighty-Four, that crystal first line sounds as natural and compelling as ever.
在奥威尔的传世之作出版六十年后，《1984》第一行的描述依旧水晶一般，历久弥新，引人注目。
When the Royal Society, the world's oldest academy of the discipline, was founded in London in 1660, the subject was referred to as natural philosophy.
世界上最古老的学科学会—皇家协会(Royal Society)是于1660年在英国伦敦成立的，当时这门学科指的是自然哲学。
The frogs' resilience is linked to a shifting of water to areas less likely to be damaged by freezing, as well as natural "antifreeze" in their blood.
这种蛙类的回复机制是这样的：通过把水分转移到一些不会被冰冻伤害的部位，以达到一种“血液防冻剂”的目的。
The frogs' resilience is linked to a shifting of water to areas less likely to be damaged by freezing, as well as natural "antifreeze" in their blood.
这种蛙类的回复机制是这样的：通过把水分转移到一些不会被冰冻伤害的部位，以达到一种“血液防冻剂”的目的。
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