邮局中的辨字员

例句：

1. 1.I need to send a letter to my friend in Beijing.
   我需要寄一封信给我在北京的朋友。
2. 2.The post office is just around the corner.
   邮局就在拐角处。
3. 3. He has a postal code for his new address.
   他有一个新地址的邮政编码。