What is written on the envelope of the recommendation letter for studying in the United States?

English envelopes are usually written as follows: first write the name and address of the sender in the upper left corner, and then write the name and address of the recipient in the middle. No matter the recipient or the sender, the name should be written first, then the address, and the name should occupy a single line. The name of the place should be capitalized from small to large, and the visual length should account for two, three, four and five lines.

on the envelope, the sender only writes his name without a title, but the recipient's name is usually preceded by a title to show courtesy and respect. For people who don't have official titles, they usually ask the teacher to sign and seal the envelope with their names. It's just a procedure anyway.

PS: It's best to attach 2-3 self-adhesive labels (in Chinese and English) to your application materials bag, and it's best to print (each application envelope). Don't underestimate this convenience, which can make your application quite exciting.