来自《耶鲁大学开放课程：生物医学工程探索 第19集 第19集》

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  so fish often have streamlined shapes.
  鱼类通常具有流线型的身体
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  They might be flat.
  它们可能是平的
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  The look like flat plates sometimes, some kinds of fish.
  某些种类的鱼看起来像平板
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  That's an easier shape, a more streamlined shape
  这种形状更简单 鱼体流线型程度越高
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  creates less drag as it moves through water
  它在水中游动时产生的拖曳力就越小
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  than a bulky shape like a cube or a sphere.
  比方形或球形这样愣头愣脑的形状都要小
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  Streamlining or shape is an adaptation that animals can use
  流线型或者说动物的形体是它们为了
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  in order to move faster.
  更快地运动而做出的适应
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  You know this if you swim, if you want to swim
  你知道如果你游泳的话 如果你想游泳
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  and just glide through the water, push off from the side
  你可以只靠滑行 从岸边一脚蹬开
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  and just glide, if you go like this
  然后只需滑行 如果你像这样滑行
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  you're not going to glide very far.
  那你滑不了多远