来自《耶鲁大学开放课程：聆听音乐 第23集 第23集》

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  this is a typically Western exercise that we are dealing with here.
  我们这里所做的练习是很有西方特色的
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  We love to organize material so that we can simplify it
  我们喜欢组织材料 使其简化
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  and we can deal with it--
  并可以用不同方式分析处理它们
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  whether it's attributing to an individual,
  不论材料是属于个人
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  things that a large number of people do,
  还是需要多人合作完成
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  whether it's grouping random units of pulses into meter,
  不论是将随机的鼓点组合成节拍
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  or whether it's taking a highly complex group of phenomena
  还是面对一组非常复杂的现象
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  and putting them particular style periods,
  并将这些现象归入特定的风格时期
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  we like to do that
  我们喜欢这么做的原因是
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  because it allows us to deal with the material in some kind of organized fashion.
  这可使我们以某种有序的方式处理资料
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  So we've got our various periods up here.
  因此我们在黑板上列举了不同风格时期
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  As mentioned though,
  之前提过