政策怎样和为什么变革？
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.
这就是为什么重读的行为如此丰富而具有变革性。
That's what makes the act of rereading so rich and transformative.
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