human concepts of space and time
if the light emitted by radar description of an event
when echo is received， the observer can measure time
时间是发出和反射两个时刻的中点
一个事件是发生在空间的单独一点
没有一个测量者比其他任何人都对
但是这些所有的测量都息息相关
midpoint of the time was issued and reflection of moments
an event is a single point in space
none of the measurements than anyone else on
but all of these measurements are closely related
每个观测者都测出光具有同样的速度
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