There is not direct mathematical relations among virtual front time, virtual tail time and theoretical front time, theoretical tail time of lightning impulse.

雷电波的视在波头时间和视在波尾时间与理论波头时间和理论波尾时间没有直接的数学关系。

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Like Dr Ehrsson's experiment, volunteers were fitted with stereoscopic headsets and were shown images of virtual figures -- this time the figures appeared in front of them.

CNN: Scientists recreate out-of-body experience