"Postcard"是英语中明信片的说法。这个词来源于古英语中的"post"，意为"邮寄"，和"card"，意为"卡片"。
例句1：I received a postcard from my friend who is travepng in Europe.
翻译：我收到了一张我朋友在欧洲旅行时寄来的明信片。
例句2：I bought a postcard of the Eiffel Tower to send to my family.
翻译：我买了一张埃菲尔铁塔的明信片给我的家人寄去。
例句3：I wrote a postcard to my grandparents while on vacation.
翻译：我在度假时给我的祖父母写了一张明信片。