翻译下面的段落。 The only way to learn mathematics is to do mathematics. That tenet is the foundation of the do-it-yourself. The right way to read mathematics is first to read the definitions of the concepts and the statements of the theorems, and then, putting the book aside, to try to discover the appropriate proofs. If the theorems are not trivial, the attempt might fail, but it is likely to be instructive just the same. To the passive reader a routine computation and a miracle of ingenuity come with equal ease, and later, when he must depend on himself, he will find that they went as easily as they came. The active reader, who has found out what does not work, is in a much better position to understand the reason for the success of the author's method, and, latter, to find answers that are not in books. (P.R.Hamlos, U.S.A)