To survive in that sort of environment, animals have to adapt to evolve in response to their surroundings.

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。

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Most of the wild animals are in danger because of their bad living environment.

由于生存环境恶劣，大多数野生动物都处于危险之中。

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Reduced reliance on chemicals in agriculture is part of the solution, says Buchmann, since all animals need their immune systems in top shape to combat pathogens in their environment.

布克曼认为，减少对化学物质的依赖也是部分的解决之道，因为为了对抗环境病原体的侵入，所有动物的免疫系统都要保持最佳状态。

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Although she has spent her life trying to protect chimps in their natural environment, these animals are still very much in danger.

VOA: special.2009.11.18

Similarly, in another test of anxiety, animals were given the choice of venturing out on an elevated and unprotected bar to explore their environment, or remain in the relative safety of a similar bar protected by enclosing walls.

FORBES: Thinking With Your Gut. Literally.