他找的百度百科的，不知道是谁翻译的，最好还是看原文  
  
【 在 qiuzhizhe (求知者) 的大作中提到: 】
:  我知道你这个“海平面”哪里来的了，垃圾国内翻译啊。。。、
:  
:  Wiki百科的原文是这样“Since 1967, the second has been defined as exactly "the duration of 9,192,631,770 periods of the radiation corresponding to the transition between the two hyperfine levels of the ground state of the caesium-133 atom" (at a temperature of 0 K).”
:  
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FROM 223.104.38.*