Flu shots cost $20 at the drugstore. Only a few people are buying the flu shots. There are no long lines. No one is waiting in line. If you want the flu shot, pay $20. You don’t have to wait in line. You can get the flu shot immediately. The mayor announced free flu shots. He said, “We will give free flu shots to everyone. Come to the library on Saturday.” On Saturday 2,000 people went to the library. They stood in line for four hours. After four hours, there were no more free flu shots. They ran out of free flu shots. The drugstore still has many flu shots. But the flu shots at the drugstore aren’t free. They cost $20.
    在藥店疫苗要花費(fèi)20美元。只有少數(shù)人買疫苗。沒有排的長長的隊(duì)。沒有人排隊(duì)。如果你想打疫苗，要付20美元。你不需要排隊(duì)。你可以馬上打疫苗。市長宣布了打免費(fèi)疫苗的通知。他說，“我們將給每個(gè)人免費(fèi)打疫苗。周六來圖書館打。”周六2000人去了圖書館。他們排隊(duì)排了4個(gè)小時(shí)。四個(gè)小時(shí)候，免費(fèi)疫苗打完了。他們已經(jīng)用完了免費(fèi)疫苗。藥店還有很多疫苗。但是藥店的疫苗不是免費(fèi)的。它們要花費(fèi)20美元。