分析了机械能定理不满足力学相对性原理的原因在于外势能的定义，提出了对势能定义的看法。
The reason why the law of mechanical energy can not be satisfy the principle of relativity is the definition of external potential energy; and it is analyzed.
就算我知道罐子外不可能有东西存在，我也知道罐子里的奇妙，但我心里还是蠢蠢欲动不满足。
As much as I know there can't be anything outside the can, I also know that as wonderful as this can is, it doesn't seem to satisfy me completely.
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