This is the 3780th most frequent Chinese word.
郵政
Postal service.
郵政 is used to refer to the post office institution.
我去郵政局寄了一封信。
I went to the post office to send a letter.
郵政 here refers to postal services in a general sense.
郵政服務非節假日正常運行。
Postal services operate normally except during holidays.
郵政 denotes the postal system involved in transportation.