您要查找的是不是：
- envelope delay frequency 包络延迟频率
- measurement of envelop delay tracer 包络延迟跟踪测量
- group delay frequency distortion 群迟延频率失真
- group delay frequency characteristic 成组延迟频率特性
- frequency hopping and time delay frequency shift keying (FH-TDFSK) 跳频时延编码（FH-TDFSK）
- Have you stuck down the back of the envelope? 信封背面开口处贴牢了吗？
- 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。
- No delay! We urgently need these books. 决不要拖延！我们急需这些书。
- 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。
- The delay made the patient go purple in the face. 时间的拖延使病人脸色发紫。
- We decided to delay our wedding until next year. 我们决定把婚礼推迟到明年。
- I owe you an apology for the delay. 我该为这次耽搁向您道歉。
- She opened the envelope with her fingertips. 她用指尖弄开了信封。
- Please see into this matter without delay. 请立即调查这件事情。
- The envelope's seal was torn open. 信封封缄被撕开了。
- The (flap of the) envelope was unstuck. 信封(的封口)没粘住。
