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下面是它的外观。"。 the problems are: 1) speed of light is constant; 2) time has direction; 3) the distance between origins of inertial systems can be veried。没魄力"。co。一个人在冬天带一个两岁孩子出去,当过妈妈的应该明白这意味着什么。
下面是它的外观。"。 the problems are: 1) speed of light is constant; 2) time has direction; 3) the distance between origins of inertial systems can be veried。没魄力"。co。一个人在冬天带一个两岁孩子出去,当过妈妈的应该明白这意味着什么。