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一个专心认真备课的教师,能够拿出一个有意义的但又不太复杂的问题,去帮助学生发掘问题的各个方面,使得通过问题,就好像通过一道门户,把学生引入一个完整的理论领域.——G·波利亚
A teacher who is concentrating on preparing lessons carefully can come up with a meaningful but not too complex problem to help students explore all aspects of the problem, so that passing problems is like using a portal to introduce students to a complete theoretical field. - G. Polya