真佩服你，真有耐心
  
【 在 qiuzhizhe (求知者) 的大作中提到: 】
:  问题是你说的科学界和我看到的科学界的东西不一样啊。我看到的定义是这样的
:  
:  “The second is defined as being equal to the time duration of 9,192,631,770 periods of the radiation corresponding to the transition between the two hyperfine levels of the fundamental unperturbed ground-state of the caesium-133 atom”
:  
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FROM 112.17.240.*