One can easily conjecture about what the textbook theory leaves out, but it will take more research to sort things out.
我们可以很容易推测出教科书的理论出了什么问题，但事情的本质还需要用更多的研究来发掘。
2
Preparing a lecture or drafting a textbook chapter reveals holes in your understanding. And, sometimes, as you try to fill these holes, you get ideas for research.
准备讲座或起草书稿能反映你所知的不足，而有时当你想要弥补这些不足时，往往能获得研究的灵感。
3
An additional point: Peter Norvig is Director of Research at Google, author of the leading textbook on artificial intelligence, and may be one of the better programmers alive.