to seal a letter

• 封上信

to seal a letter的用法和样例：

例句

1. After sealing on the letter,he asked Jane to take to Mr. Jones.
   封上信以后，他让简带给琼斯先生。
2. I have just posted the letter when I remember that I hadn't enclosed it.
   我刚把信寄出，我就想起我没有封上信。