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剧情:
https://www.bbc.co.uk/iplayer/episode/b0bb33ht/horizon-2018-3-how-to-build-a-time-machine  Timetravelisnotforbiddenbythelawsofnature,buttobuildatimemachine,wewouldneedtounderstandmoreaboutthoselawsandhowtosubvertthemthanwedonow.Andeveryday,sciencedoeslearnmore.InthisfilmHorizonmeetsthescientistsworkingonthecuttingedgeofdiscov..ddd