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-threshold detection包络阈检测envelope delay sweep generator包络延迟扫描振荡器Envelope demodulation analysis包络解调分析Envelope of family of surfaces曲面族的包络envelope approximation circuit包络近似电路envelope delay distortion meter包络延迟失真测量仪envelope for dental X-ray film牙科X射线胶片套envelope correlation coefficient包络相关系数Envelopes for express mail service邮政特快专递封套envelope of resultant light signal光拍信号包络