Because the speed is too fast, it is difficult for the human eye to reach and see with the naked eye, Tianxin has been thinking about this mode of transportation for a long time, but he has no choice but to give up the wonderful name of "empty iron" and use the name of vacuum two-way composite channel, which is close to the principle but has fallen off the soil.

Can you tell me about this experience? Of course, I can’t say that, first of…

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