Binvalidation of the Slowly-Varying Envelope Approximation and Producing and Eliminating of the Spatial Singularity for Ultrashort Pulsed-Beam Propagation in Free Space是什么意思_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(xiàn)翻譯_英語(yǔ)_讀音_用法_例句