许多狼和其他肉食动物已被猎捕殆尽，没有狼和其他肉食动物的存在，在这些地区鹿的数量急剧增加。

Without wolves or other predators, many of which have been wiped out by hunting, the number of deer in these regions has soared.

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另外一个试验中，动用了13个小组，研究者考察了在“囚徒困境”的游戏中动物的存在将如何的改变参与者的行为模式。

In the other experiment, which used 13 groups, the researchers explored how the presence of an animal altered players' behaviour in a game known as the prisoner's dilemma.

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对我来说，动物园存在的惟一正当理由就是它的教育意义。

To me the only justification for a zoo is educational.

《柯林斯英汉双解大词典》

And the more I went into it, the more I thought as I see something seriously wrong here with the way we think about animals and the way we treat animals.

于是，随着研究的深入，我所思考的也越来越多,我发现我们对于动物的认识,我们对待动物的方式,存在着严重的问题。

普林斯顿公开课 - 人性课程节选

And it does have that effect of making you feel like you want this to be in the world.

这个博物馆确实使你产生想让这些野生动物们存在下去的想法。

美国的博物馆教育 - SpeakingMax英语口语达人