t-25:to the purpose 中肯地
a:i have an assignment on world water reservation. i have no idea of it.
a：我们布置了一篇关于世界水资源问题的作业，我一点想法都没有。
b:why not go to the library?
b：为什么不到图书馆去看看呢？
a:it has been closed now, but i have to hand it in tomorrow.
a：图书馆已经关门了，而我明天就得交作业。
b:don't worry. i have some books to the purpose. it may be helpful to you.
b：别着急，我这儿有几本与这个问题有关的书，也许对你有用。
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