来自《耶鲁大学开放课程：心理学导论 第12集》

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  or an environmental connection.
  还是环境原因
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  The one thing we do know is that in the middle ground,
  能确定的是 在中间情况下
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  effects tend not to be dramatic.
  影响不太明显
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  So when you get away from extreme cases,
  除非在极端情况下
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  effects are hard to see
  否则影响很难观察
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  and require careful experimental research to tease out.
  需要仔细的实验来梳理结论
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  I think what it's safe to say for a lot--for everything
  我认为对很多 对所有事情来说
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  but the severe conditions
  可以确定的是 除非是极端情况
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  is we don't know what kind of effects there are.
  否则 我们不知道会有什么样的影响
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  But if there are effects they are not big and dramatic ones.
  即使有影响 也不会很大很明显
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  Okay.
  好的
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  Animals' good feelings,
  动物的好感