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中文摘要：
“异地时钟的同步”和“相继时间段（绵延）的测量”是时间研究中的重大问题．庞加莱认为这两个问题相互关联，而且只有通过“约定”才能加以解决．他推测通过“约定”真空中光速的各向同性有可能解决上述问题．
英文摘要：
The authors admire Poincare＇s idea that the convention on the nature for light propagation is the foundation of the measurement of time and point out that the conventions on the light velocity is just the convention on the symmetries of space time. The conditions on the transitivity of synchronization of clock rate are shown. With the condition, not only the question about the definition of the synchronization of rate of clocks located at different places is answered, but also find the solution to the definition of the equality of two durations is found.
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