阅读短文，翻译划线部分的句子。
Every town in the United States has a post office . Some are very small , and you may also find them in the corner of a shop . Others are larger buildings . They are open five days a week and on Saturday mornings . From Monday through Friday they are usually open from 8：30 to 4：30 .
If you know how much the postage (邮资) is for your letter , you can buy stamps at any window. In some post offices you can buy stamps from machines . Stamps are sold many different prices , from one cent (美分) to many dollars . If you are not sure how much postage is for you letter , you may ask the man or the woman in the post office for help . He or she will give you the stamps you need . If you are sending your letter far away , you should use airmail envelopes (航空信封) . Remember that postage will be more expensive for a letter to be sent outside the country.
你也可以在邮局买明信片.明信片比信件要便宜. Usually the price of postage for a postcard is about half that of a letter . The postcards that you buy at a post office do not have pictures . However ,also they are not to be sent outside the country .
Letters are an easy and cheap way to keep in touch with people in many different countries .
_____________________________________________________________
_____________________________________________________________
_____________________________________________________________
_____________________________________________________________
_____________________________________________________________