envelope of the pulse

envelope of the pulse back-of-the-envelope I love,like the pulse of resonance with the peripheral pulse wave Taking the pulse 是什么意思? 这句话什么意思? "The goodness of the bounding envelope " pulse an envelope of 英语翻译CLOSELY FOLLOW THE PULSE OF FRSHION,QURLITY RRE THE OWNE pushing the envelope是什么意思 pushing the envelope push the envelope是什么意思