Binvalidation of the Slowly-Varying Envelope Approximation and Producing and Eliminating of the Spatial Singularity for Ultrashort Pulsed-Beam Propagation in Free Space是什麼意思_Binvalidation of the Slowly-Varying Envelope Approximation and Producing and Eliminating of the Spatial Singularity for Ultrashort Pulsed-Beam Propagation in Free Space在線翻譯_英語_讀音_用法_例句