来自《耶鲁大学开放课程：聆听音乐 第13集 第13集》

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  Some were slightly closer together,
  有些音会比较接近
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  and then others farther apart.
  有些音会比较远离
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  And the key of C actually had a slightly different sound
  C实际上听上去和D
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  than the key of D,
  只有一点点差别
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  and it's only in the eighteenth and nineteenth century
  直到十八至十九世纪
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  that we gradually shifted from an unequal keyboard
  我们才逐渐由不均调的键盘乐器
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  to an equally tuned keyboard.
  过度到了均调的键盘乐器
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  So Bach is kind of part of this transition
  所以巴赫正处在
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  to the equal-tuned keyboard.
  向均调键盘转型的时期
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  He was getting close to the equal temperament of the modern keyboard
  他开始逐渐熟悉均调的现代键盘
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  and that's why he called it the well-tuned keyboard,
  这就是为什么他称之为平均律键盘
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  and it--by tuning it this way,
  就调音而言