时间旅行无常，因果交织，探索未知的奇妙旅程。亚洲男同vidoes免费

　　Brian takes an audience, with the help of celebrity guests, on a journey into the wonderful universe of The Doctor, in a specially recorded programme from the lecture theatre of the Royal Institution of Great Britain. 　　Brian reveals the science behind the spectacle and explains the physics that allows Doctor Who to travel through space and time. Fun, but filled with real science... (展开全部)