backward travel 中文意思是什麼
backward travel
解釋
後退行程-
In a negative index material ( nim ), the peaks and troughs of an electromagnetic wave travel backward even though the energy of the wave continues to travel forward
在負折射率材料中,電磁波的波峰和波谷將朝相反方向行進,但波的能量仍向前行進。
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