来自《耶鲁大学开放课程：基础物理 第9集 第9集》

• 
  
  Of course, that's not the complete dynamical information,
  当然 这不是完整的动力学信息
• 
  
  because it also depends on how fast it's rotating.
  因为还得考虑它转得有多快
• 
  
  But to simply say the analog of where the body is
  但简单而言 这个物体在一维空间的位置
• 
  
  in one dimension is this angle θ.
  就好比是这个角度 θ
• 
  
  So, what we are going to set up,
  我们接下来的做法是
• 
  
  you'll find is an analogy between one dimensional translation
  你会看到一个一维平动
• 
  
  and two dimensional rotations.
  和二维转动的类比
• 
  
  You'll find the analogy is very helpful.
  你会发现这个类比很有用
• 
  
  So, I'm going to use a piece of the blackboard
  那我现在就在这个黑板上
• 
  
  where I'll keep drawing that analogy.
  把这个类比写下来
• 
  
  I do this because
  我这么做是因为
• 
  
  the number of things you have to remember will be reduced
  这样的话你就可以少记一些东西