您要查找的是不是：
- Have you stuck down the back of the envelope? 信封背面开口处贴牢了吗？
- I felt constrained to do what he told me. 做他叫我做的事,我心里很不舒服。
- He steamed the stamp off the envelope. 他用蒸汽把信封上的邮票揭下来。
- Our research has been constrained by lack of cash. 我们的研究工作因缺少现金而受到限制。
- 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。
- 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。
- There are several enclosures in the envelope. 信封内装有几份附件。
- I feel constrained to write and protest the decision. 我不得不写信抗议这一决定。
- An envelope or wrapper for mail. 封套，信封为邮寄而制的信封或封套
- envelope constrained 包络约束
- Cold weather constrained the plant's growth. 寒冷的天气抑制了植物的生长。
- A good way to remove a stamp from an envelope is to soak it off. 从信封上取下邮票的一个好办法就是用水把它泡下来。
- I enclose a stamped addressed envelope for your reply. 兹附上贴有邮票并写好地址的回邮信封。
- He ripped off one end of the envelope and pulled out the letter. 他撕开信封的一端，抽出里面的信件。
