嘎洒镇兼职的生活照片(可约)
the problems are: 1) speed of light is constant; 2) time has direction; 3) the distance between origins of inertial systems can be veried。。我旅行是为了放松、刷新和恢复活力。
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the problems are: 1) speed of light is constant; 2) time has direction; 3) the distance between origins of inertial systems can be veried。。我旅行是为了放松、刷新和恢复活力。