1.如播卡顿或失败可切换片源。
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3.我们最近发现视频里开始有插播广告，每个视频大概有好几秒，可以用快进跳过。这些广告都是视频源那边自带的，我们这边无法控制，谢谢大家的谅解。
年份：
2018
主演：
类别：
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...
