1, prepare two airmail envelopes, preferably larger, because cows will send their postcards back so as not to lose them.

2. Write down your address on the first envelope (no need to stamp).

Note: the sender should write in the upper left corner of the envelope and the recipient in the lower right corner of the envelope.

Example: Write it in the lower right corner of the first envelope.

XXX (receipt)

The specific address and zip code of the family.

XX City/Province (e.g. Beijing)

People's Republic of China (PRC)

3. Write the address of the cow in the lower right corner of the second envelope (write in the following format, paying attention to case).

R. Federer

Postfah

4 103 bottle root

Switzerland

4. Put the first envelope and the letter to the cow in the second envelope, and don't put anything in the first envelope.

Go to the post office and tell the person in the post office that it will be sent to Switzerland. He will weigh the letter, then tell you the postage, put a stamp on the money, and give it to him and it will be OK. Remember not to put the written letter into the mailbox.

Step 6 wait for the cow's reply ..........