来自《耶鲁大学开放课程：聆听音乐 第13集 第13集》

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  then we're finished with the exposition;
  呈示部就结束了
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  all the voices have exposed the theme in their range.
  所有声部都用独特的音域呈现了主题
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  After that we go to what's called the "Episode"Of a fugue.
  接下来我们来看看赋格的插句
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  What happens in an episode?
  插句是什么
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  Well,usually it modulates key
  它通常用于转调
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  and the vehicle through which composers frequently modulate
  作曲家们频繁转调 借助的方式是
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  is melodic sequence,either up or down.
  旋律模进 上行或下行
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  You can kind of move around by using sequence.
  旋律模进可以用来调整
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  You can get to different places by using sequence.
  可以借助旋律模进来转换
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  So it tends to be contrapuntal
  插句是对位的
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  because it's using little motives from the theme.
  因为它使用了主题中的部分动机
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  It modulates,moves around a lot,
  通过转调 上下变化