您要查找的是不是：
- Pulse Envelope Correlation Air Navigation 脉冲包线相关空中导航
- With such short pulses, it is important to be able to control the precise relation between the individual oscillations of the electric field (the carrier wave) and the pulse envelope. 脉冲这麽短时，精确控制电场（载波）的单一振荡和脉冲包络线之间的关系就显得很重要。
- Have you stuck down the back of the envelope? 信封背面开口处贴牢了吗？
- An unwanted false electronic pulse. 一种不希望有的假电子脉冲。
- He steamed the stamp off the envelope. 他用蒸汽把信封上的邮票揭下来。
- He glued a stamp onto the envelope. 他把邮票贴在信封上。
- As he picked up the envelope, a key dropped out. 他拣起信封时，一把钥匙掉了出来。
- As she picked up the envelope, a key dropped out. 她拾起信封时，一把钥匙掉了出来。
- Put a stamp on the envelope, will you? 在信封上贴张邮票，好吗？
- He stuck a stamp on the envelope. 他在信封上贴上邮票。
- She opened the envelope with her fingertips. 她用指尖弄开了信封。
- He knew the pulse of the nation. 他了解国民的心态。
- The envelope's seal was torn open. 信封封缄被撕开了。
- The doctor took my temperature and my pulse. 医生量了量我的体温和脉搏。
- The (flap of the) envelope was unstuck. 信封(的封口)没粘住。
- The excitement quickened my pulse. 激动使我的心跳加快。
- There are several enclosures in the envelope. 信封内装有几份附件。
- The machine is operated by an electronic pulse. 这台机器由电子脉冲信号操纵。
- He knew the pulse of the people. 他了解人民的意向。
- An envelope or wrapper for mail. 封套，信封为邮寄而制的信封或封套
