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Created April 4, 2015 06:24
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公式的用处
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公式.md

假设：

  • A(n)=n个光通路
  • B=可更换镜头
  • C(n)=n个反光板
  • D=光学取景器

从而，可得：

  • 单电=A(1)+B+^D
  • 无反=A(1)+B+C(0)+^D
  • 单反=A(1)+C(1)+D
  • 双反=A(2)+C(2)+D

咖啡店各种咖啡都是用espresso做的。做出来就喝的是意式咖啡（E）。则：

  • 美式咖啡=E+水
  • 拿铁咖啡=E+奶
  • 摩卡咖啡=E+巧克力
  • 卡布其诺=E+奶油
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