Part 3 替代能源
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.. centered::
   *The options have not changed in 50 years.*
.. centered::
   *There is nothing new under the sun.*

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.. toctree::
   :maxdepth: 2
   :caption: Part 3 目录

   ch10
   ch11
   ch12
   ch13
   ch14
   ch15
   ch16
   ch17