A：
Mary, come here. I've found the book our teacher recommended us to buy last week.
玛丽过来。我已经找到了老师上周推荐我们买的那本书。
B：
Really? How much is it? Oh, it's 42 yuan! How expensive!
真的？多少钱一本？哇，要42元呀。真贵啊！
A：
You know, it is the best seller for this year. It has had its fifth impression since its publication early this year.
你知道，这可是今年最畅销的书。从今年年初出版以来这本书已经重印五次了。
B：
How come? I have never seen such a popular book before.
怎么会？我以前从未见过有这么热门的书。
A：
Wait a minute. I found there were two printings. The paperback books must be much cheaper.
等等。我发现这里有两种印刷本。平装本的书肯定要使宜得多了。
B：
。