社会要生存需要建立有高度适应性的行为准则。
Societies need to develop highly adaptive behavioural rules for survival.
为生存而挣扎的农民们把森林伐光来作农业用地。
Farmers struggling for survival strip the forests for agricultural land.
他主要在纽约市工作，那里的生存空间出了名地昂贵。
He worked mainly in New York City where living space is notoriously at a premium.
一场生存的斗争随之而来。
如果锌如此缺乏，硅藻是如何生存的呢？
中生代的动植物在新生代无法生存。
Plants and animals from the Mesozoic era were unable to survive in the Cenozoic era.
创新是企业生存的关键，公司投入大量资源鼓励员工提出新想法。
Innovation is key to business survival, and companies put substantial resources into inspiring employees to develop new ideas.
在动物园出生和长大的这些动物无法在野外生存。
Born and raised in a zoo, these animals would not be able to survive in the wild.
不能察觉危险的动物无法生存。
这是灌木能在北极生存的原因之一。
That's one of the reasons that shrubs survive in the Arctic.
低盐度和高温有利于海星幼虫的生存。
Low salinity and high temperatures favor the survival of the starfish larvae.
因为得不到生存所需的营养，有些人最终可能会饿死。
But some may eventually starve because they are not getting the nutrients they need to live.
麦克·劳说：“向外迁移的地区使行星和小行星得以生存。”
"Regions of outward migration allow planets and planetoids to survive, " Mac Low said.
结果，根据这个理论，依赖植物多样性的冰河时代动物无法生存。
As a result, so the theory goes, the Ice Age animals that depended on plant diversity couldn't survive.
攻击性是一种天生的生存机制，一种自我保护的本能，使动物能够保护自己不受生存威胁。
Aggression is a kind of innate survival mechanism, an instinct for self preservation, that allows animals to defend themselves from threats to their existence.
经济衰退削弱了很多企业的实力，以至于很多无法再生存下去。
The recession has weakened so many businesses that many can no longer survive.
物竞天择确保只有最适应环境的物种才得以生存下来，把基因传递给下一代。
Natural selection ensures only the fittest survive to pass their genes on to the next generation.
一方面，如果身体没有足够的胆固醇，我们将无法生存；另一方面，如果体内胆固醇过多，多余的胆固醇就开始让动脉变厚。
On the one hand, if the body doesn't have enough cholesterol, we would not be able to survive. On the other hand, if the body has too much cholesterol, the excess begins to line the arteries.
森林污染严重影响了植物的生存，其次也对野生动物造成了影响。
The pollution of the forest has seriously affected plant life and, to a lesser extent , wildlife.
我们的生存与雨林的生存息息相关。
Our survival is inextricably linked to the survival of the rainforest.
服装业竞争极为激烈，要想生存就要有足够的关系。
The rag trade is extremely competitive, and one needs plenty of contacts in order to survive.
他讲述了沦为阶下囚的4个月中生存的种种不易。
He described the difficulties of surviving for four months as a captive.
蛋白物的生存取决于骨骼形成化石的方式。
The survival of the proteins depends on the way in which bones are fossilized.
“适者生存”，一个几乎无可辩驳的口号。
"the survival of the fittest," a slogan that virtually preempted all debate.
如果婴儿不哭闹，就不太可能得到维持生存所需的关注。
If an infant does not cry out, it is unlikely to get the attention it needs to survive.
他们使从南方迁徙过来的波斯瞪羚的后代可以生存下去。
They subsisted offspring migrations of Persian gazelles from the south.
为了在那样的环境中生存，动物必须进化，以适应周围的环境。
To survive in that sort of environment, animals have to adapt to evolve in response to their surroundings.
大脑维持着动物生存的基本活动，如呼吸、充足的休息和心跳。
The brain sustains the elementary activities of animal survival such as respiration, adequate rest and a beating heart.
数千万年来这些庞大的生物都繁荣生存。
For tens of millions of years, those great creatures had flourished.
在这样低温限制了生存的区域，近地表的额外热量至关重要。
In an area where low temperatures are limiting to life, the importance of the additional heat near the surface is crucial.
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