envelopedadj.被包围的动词envelop的过去式和过去分词形式.envelopen.信封；壳层；封袋envelope cut-off包迹截止波长envelope cartridge信封纸envelope materials囊体材料envelope protection包线保护envelope delay data包络线延迟数据enveloped RNA virus有包膜RNA病毒envelope distortion包络失真,群时延失真envelope modulation包络调制envelope extraction包络提取envelope-layering包络分层