Part 2 能源和化石燃料
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   *What worked for us in the past*
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   *cannot work for us in the future.*
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   *OWe must learn the language of our old friends*
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   *in order to say a proper goodbye.*

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.. toctree::
   :maxdepth: 2
   :caption: Part 2 目录

   ch5
   ch6
   ch7
   ch8
   ch9