从小在双语环境下长大的孩子必须关注社交线索，以弄明白在什么环境下与什么人交流该使用哪种语言。

Young children being raised bilingual have to follow social cues to figure out which language to use with which person and in what setting.

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这就是为什么环境评论家反而呼吁减少全球牲畜生产，并敦促人们减少而不是增加他们饮食中的肉类消耗。

That's why environmental critics are calling instead for reductions in global livestock production, and urging people to consume less, not more, meat in their diets.

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他们不这样做的原因，以及为什么环境没有被破坏的原因，都与价格、技术创新、社会变革和政府应对公众压力的监管有关。

The reasons why they don't, and why the environment has not been ruined, have to do with prices, technological innovation, social change and government regulation in response to popular pressure.

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But once you get into a situation, it complicates, you see things. How do that happen for you?

但一旦你到了一个环境中，有了具体情况，你就能明白，你是什么情况呢？

普林斯顿公开课 - 人性课程节选

What is it when you run a chemical reaction under ordinary circumstances, what's constant?

如果你在通常的环境下进行化学实验,那么这些条件是什么？什么保持常数？

麻省理工公开课 - 热力学与动力学课程节选

And they can watch to see what happens in terms of their interaction with the environment.

观察发生了什么,关于这些物质,和环境的互动。

麻省理工公开课 - 媒体、教育、市场课程节选