在书信文化中，信封是不可或缺的一部分。写好信封可以让收件人更加方便准确地收到信件。以下是信封写法格式图的英文描述。

The format of an envelope is important in the culture of letter writing. A properly addressed envelope ensures that the recipient receives the letter in a timely manner. Here is the format of an envelope:

1. The recipient's name should be written on the first line, followed by their street address on the second line.

2. The third line should include the city, state/province, and postal code.

3. The sender's name and address should be written in the top left corner of the envelope.

4. The stamp should be affixed in the top right corner of the envelope.

5. The return address, if different from the sender's address, should be written on the back flap of the envelope.

Following these guidelines will ensure that your letter arrives at its intended destination with ease.