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🎬 一起观影
创建一个观影房，把播放链接分享给朋友，对方输密码就能进来一起看，聊天会以弹幕的形式飘过画面。
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...