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Bob:
Tom,may I ask you a questiom? 
汤姆，我可以问一个问题吗？
Tom:
Of cause. Please go ahead.
当然，请说。
Bob:
Can you teach me how to solve this math question?
你能教我怎么解答这道数学题吗？
Tom:
Which one?
哪一题？
Bob:
The last question on page 70. I have thought it for two days but still haven’t got any progress.
70页最后一题。我已经想了两天了，但仍然没有进展。
Tom:
I see. It is a bit difficult question, I also spent one day on solving it.
我明白，这题有点难，我也花了一天的时间才解答出来。
Bob:
Now ,could you please explain it to me?
现在你可以给我讲解下吗？
Tom:
No problem, wait a moment, I go to take my notes.
没问题，等下，我去拿笔记。
Bob:
Thanks, it is very kind of you.
谢谢，你真好。
Tom:
My pleasure.
我的荣幸。