来自《耶鲁大学开放课程：基础物理 第5集 第5集》

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  it's approximately equal to 1 + n · x.
  它的值约等于 1 + n · x
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  So, let me give you one example; you will use this later on.
  我将再出一题 你们马上会用到它
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  According to relativity,
  根据相对论
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  a mass of a particle is given by this.
  物体的质量由这个式子给出
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  It's a body sitting still, it has certain mass.
  一个静止的物体有确定的质量
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  In Newtonian mechanics we say the mass is the mass
  在牛顿力学中它的质量就是那样
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  and that's the end of it.
  不会改变
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  Relativity,
  相对论中
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  you don't have to know the origin of this;
  你们暂时不需要知道它的由来
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  that'll be taught to you in due course.
  到时候会教给你们的
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  But it just says particle to the velocity have
  它表明质点的质量
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  a mass different from when they are at rest.
  受速度影响与静止状态不同