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http://physics.stackexchange.com/questions/6912/in-superluminal-phase-velocities-what-is-it-that-is-traveling-faster-than-light/
您即将离开知乎,请注意您的帐号和财产安全。
http://physics.stackexchange.com/questions/6912/in-superluminal-phase-velocities-what-is-it-that-is-traveling-faster-than-light/