您要查找的是不是：
- Envelope level for modulated vision signal 已调图像信号的包络电平
- envelope level of sync peak for modulated vision signal 已调图像信号同步顶包络电平
- 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。
- 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。
- I'd like a room on the upper level. 我想要楼上的房间。
- We need a mechanical digger to level the ground. 我们需要一台挖掘机来平整土地。
- She opened the envelope with her fingertips. 她用指尖弄开了信封。
- I hope you'll be on the level with me. 我希望你对我坦率布公。
- The envelope's seal was torn open. 信封封缄被撕开了。
- She needs to win this point to level the score. 她要赢得这一分才能将比分扳平。
- The (flap of the) envelope was unstuck. 信封(的封口)没粘住。
- Keep a level head and phone the Fire Department. 保持冷静，打电话给消防署。
- There are several enclosures in the envelope. 信封内装有几份附件。
- A football field should be level. 足球场地应该平坦。
- The rising level of crime is a sign of the times. 犯罪率增高是这一时代的特徵。
