But, you may ask, why is writing necessary? Well, the physical act of writing, with your own hand, brings words and sentences more sharply before your mind and preserves them better in your memory. To set down your reaction to important words and sentences you have read, and the questions they have raised in your mind, is to preserve those reactions and sharpen those questions. You can pick up the book the following week or year, and there are all your points of agreement, disagreement, doubt and inquiry. It's like resuming an interrupted conversation with the advantage of being able to pick up where you left off.
但是，你或许会问，写有何必要呢？要知道，亲手书写的动作会使词语和句子更加鲜明地呈现在你的脑海里，更好地储存在你的记忆中。将你对所读的重要词语和句子的感受写下来，将它们在你脑子里引起的问题记下来，就可以将这些感受长久保存下来，并可以使那些问题更加明确起来。当你下周或来年，重新拿起这本书的时候，你的各种观点，同意的、反对的、怀疑的、质询的，统统一目了然。这如同谈话一度被打断，现在又可以在上次停下的地方接着谈下去了。
And that is exactly what reading a book should be: a conversation between you and the author.Presumably he knows more about the subject than you do; naturally you'll have the proper humility as you approach him. But don't let anybody tell you that a reader is supposed to be solely on the receiving end. Understanding is a two-way operation; learning doesn't consist in being an empty receptacle. The learner has to question himself and question the teacher. He even has to argue with the teacher, once he understands what the teacher is saying. And marking a book is literally an expression of your differences, or agreements of opinion, with the author.
读书就该这么个读法:你同作者应进行对话。很可能作者在有关的问题上比你懂得多，你接近他的时候表示适度的谦恭是很自然的。但不要轻信他人，以为读者只有全盘接受的份儿。理解是一种双向活动。学习并不是往空的容器中装东西。学生应当向自己也向教师提问题。一旦理解了教师所讲的内容，他甚至还得与教师展开争论。而在书上做记号，实际上就是表达你赞同或不赞同作者观点的一种方式。