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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。之后,闸门打开了。"。Saaci 成立于 1987 年,旨在处理行业特定领域的利益,例如场地、会议和活动以及服务。
the problems are: 1) speed of light is constant; 2) time has direction; 3) the distance between origins of inertial systems can be veried。之后,闸门打开了。"。Saaci 成立于 1987 年,旨在处理行业特定领域的利益,例如场地、会议和活动以及服务。