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https://www.bbc.co.uk/iplayer/episode/b0bb33ht/horizon-2018-3-how-to-build-a-time-machine Time travel is not forbidden by the laws of nature, but to build a time machine, we would need to understand more about those laws and how to subvert them than we do now. And every day, science does learn more. In this film Horizon meets the scientists working on the cutting edge of discov...如果您喜欢免费短视频（yaya.vodpond.cc）分享的《BBC地平线: 如何制造时间机器》，别忘了推荐给你的好友！
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