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Dora：
Have you found the book recommended by Mrs. Li?
你找到李老师推荐的那本书了吗？
Daniel：
30 Nights on Nightmares? No.
《30夜噩梦》？没有。
Dora：
Mrs. Li said it was a good self-help book aiming at those who want to refresh their understanding of basic math.
李老师说那是一本不错的自学工具书，意在帮助那些想要巩固数学基础的人。
Daniel：
Not conductive to homework or exams?
对考试和家庭作业没有指导作用吗？
Dora：
She didn't mention that.
她没说。
Daniel：
I am looking for some books that have keys to our after-class exercises. What's our homework today, anyway?
我在找有我们课后练习答案的书。对了，我们今天的家庭作业是什么？
Dora：
Re-read Chapter 13 and summarize the main content in a diagram, and finish the exercises in Chapter 13.
复习第13章，用一个表格总结主要内容，并完成第13章的练习。
Daniel：
I don't understand why we must read it again. I understood everything in class.
我不明白为什么必须再读一遍。我在课堂上都听懂了。
Dora：
Mrs. Li says this second reading will help you consolidate what you've learned in class. That's why we must do homework.
李老师说再次阅读可以帮我们巩固在课堂中学到的知识。那就是我们要做家庭作业的原因。
Daniel：
But I can't do my homework without answer keys!
但是我没有答案就做不了家庭作业。
Dora：
I think maybe 30 Nights on Math is not bad. Look, it has explanations on every formula in our text book.
我觉得《数学30夜》不错。看，里面有对课本中每个公式的解释。
Daniel：
Oh, that's good! I have problems with formulas. I will get this book.
噢，那还不错。我对公式理解得不好，我要买这本书。
Dora：
I have little money left. I believe I have seen some pirated versions of this book. They are much cheaper.
噢，那还不错。我对公式理解得不好，我要买这本书。
Daniel：
Don't buy the pirated books. There are many mistakes in spelling. What's more, it's just against law to buy them.
不要买盗版书，里面有很多拼写错误。此外，买盗版书是违法的。
Dora：
It's against law? Oh, I didn't know it was that serious! But I don't have enough money for that book.
违法？噢，我不知道有那么严重。但是我没有足够的钱来买那本书。
Daniel：
You can sell your Harry Potter to me for cash.
你可以把你的《哈利.波特》卖给我，我给你钱。