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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。"听说西藏是要去两次的,第一次把心留下了,打算这次把它带回来。
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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。"听说西藏是要去两次的,第一次把心留下了,打算这次把它带回来。