2015年衛(wèi)生類職稱英語考試備戰(zhàn)已經開始了，這是小編整理的一些常見的語法，希望對您能有所幫助。開心生活，快樂學習。每天進步一點，積累下來便是巨大的進步。

    The first United States airmail stamp has had an interesting story. Printed in 1918,this 24-cent stamp with a blue plane inside a rose border became the center of much attention.One hundred of the stamps sold to the public became known as "inverts",for the plane was printed upside down.Some of these "upside-down" airmail stamps are now worth over $6,000.

    關于美國的第一枚航空郵票有一個有趣的故事。這枚面值為24美分的郵票印刷于1918年，玫瑰花邊的中間有一架藍色的飛機，成為人們關注的中心。因為藍色的飛機被印顛倒了，僅僅有一百枚這種“倒轉”郵票賣給公眾�，F在，有些這種“倒轉”航空郵票價值超過6000美元。