来自《耶鲁大学开放课程：基础物理 第16集 第16集》

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  Then, we say the new complex number called z*
  我们再引入一个新的复数 z*
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  and it's defined to be x-i`y,
  定义其值为 x-i·y
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  is called the complex conjugate;
  称为共轭复数
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  complex conjugate of z
  也就是 z 的共轭复数
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  It's obtained by changing the sign of i.
  改变 i 前面的符号即可
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  So, if you like, if z is sitting here, z* is sitting there,
  如果 z 在这里 z* 就在横轴下方
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  reflected around the x axis.
  两点关于x轴对称
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  So, how does one work with complex numbers?
  要怎么应用复数呢
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  You add them, you subtract them,
  可以相加相减
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  and you multiply them, and you divide them.
  也可以相乘相除
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  If you know how to do that, you can do with complex numbers
  掌握这几种基本运算 便可举一反三
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  everything you did with real numbers.
  对复数做所有的实数运算