为了生存，人类需要对世界有一个合理准确的看法。
Humans need a reasonably accurate view of the world in order to survive.
今天，许多人开始意识到，为了保护环境和为了人类的生存，我们需要更多的人成为素食者。
Today, many people have come to realize that to help the environment and for the human race to survive, more of us will need to become vegetarian.
为了生存，人类和大自然不断地进行着斗争。
In order to survive, man is engaged in a constant struggle with nature.
人类的家庭形式是为了应对来自生存环境的压力。
The form the human family takes is a response to environmental pressures.
为了在两极生存，人类必须尽可能穿最温和的衣物，必须建立防风住所。
To survive men must wear the warmest possible clothing. They must build windproof shelters.
为了在两极生存，人类必须尽可能穿最温和的衣物，必须建立防风住所。
To survive men must wear the warmest possible clothing. They must build windproof shelters.
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