First, the use:
1, as a noun, means: letter; Letters.
As a verb, it means: write it down; Printing.
Second, the phrase:
The letter wrote down the name and address on the envelope.
Answer a letter.
The end of the letter.
Date the letter.
Send letters. Send letters.
Put down a letter
Expect a letter, etc.
Fold a letter.
Forward a letter.
Received a letter.
Read a letter in a hurry.
Received a letter.
Synonym message:
1, the basic meaning of message is "information, message", which can refer to any information obtained by people through observation, reading or communication, but it is not necessarily accurate. It can also refer to information published by newspapers, radio or television.
2. Information can also be interpreted as "gist and theme", which generally refers to the political, moral and social revelations and predictions made by prophets, writers and books.
After the news, it can sometimes be used as the attribute of infinitive or that clause.