来自《耶鲁大学开放课程：基础物理 第1集 第1集》

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  I don't know how much you've seen,
  我不知道你们对物理有多少了解
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  but quite often the way you learned physics earlier on in high school
  但你们以前在高中所学的物理知识
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  is probably different from the way
  和资深物理学家们的看法
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  professional physicists think about it.
  常常是很不一样的
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  The sense of values we have,
  我们的价值体系
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  the things that we get excited about are different,
  我们的兴趣范围都是和你们不一样的
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  and the problems may be more difficult.
  这些问题可能会更难
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  But I want to start in every example,
  所以我会都从最简单的例子讲起
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  in every situation that I explain to you,
  在我给你们解释的每一个例子里
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  with the simplest example, and slowly add on things.
  都会用最简单的例子 然后慢慢增加难度
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  So, what we are going to study now
  我们现在所要研究的的
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  is a non-living object
  是一个没有生命的物体