大家都搜：
密封信封
1、fertilization envelope───受精囊
2、prc envelope───中华人民共和国信封
3、envelope sizes───信封尺寸
4、seal───vi.猎海豹；n.密封；印章；海豹；封条；标志；n. (Seal)西尔（人名）；vt.密封；盖章
5、red envelope───n.红包
6、diffraction envelope───衍射包络
7、envelope───n.信封，封皮；包膜；[天]包层；包迹
8、downcomer seal───降液管液封
9、apostille seal───使徒印章
1、At the end of the letter, seal it in an envelope, write the date to open it on the cover and put it in a safe storage space.───写完信，把它装到信封里，在信封的封面上写上日期，把它妥善保管起来。
2、TO ENSURE CONFIDENTIALITY, please enclose the report in an envelope and sign on the seal line before giving the report to the applicant for submission.───为确保推荐信的保密性，请推荐人将推荐报告置于信封内，密封后在信封口签名，再给申请者呈交。
3、The mail room personnel create an envelope by using the recipient information in your letter, seal your letter in an envelope, and drop the envelope in the mailbox for delivery.───收发室人员使用信件中的收件人信息制作信封，并将信件封在信封中，然后将信封投入信箱以进行投递。