第九章: 虫洞和时间旅行 Wormholes and Time Travel | 时间简史

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The last chapter discussed why we see time go forward: why disorder increases and why we remember the past but not the future. Time was treated as if it were a straight railway line on which one could only go one way or the other.

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But what if the railway line had loops and branches so that a train could keep going forward but come back to a station it had already passed? In other words, might it be possible for someone to travel into the future or the past?

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第九章: 虫洞和时间旅行 Wormholes and Time Travel
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