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为了发挥教具的直观作用,取得理想的效果,教具的使用应“掌握火候”。迟了,演示与讲解脱节,不能收到应有的效果,早了,学生没有看教具的要求,不能引起学生的兴趣,好象一个人还没有饥饿硬要他吃饭一样,总是不那么迫切需要。那么怎样才算掌握火候呢,我认为应根据“不愤不启”的原则,也就是同学们急于理解而又无法理解的时候,运用直观教具才最为合适,如教学部编五年制第7册练习35
In order to give play to the visual effects of teaching aids and achieve the desired results, the use of teaching aids should “master the heat.” Too late, the demonstration is out of line with the explanation, can not receive the desired effect, and early, students do not see the requirements of teaching aids, can not arouse students' interest, as if a person is not hunger hard for him to eat, always less urgent need. So how can we handle the heat? I think it is most appropriate to use visual aids when teaching students to be eager to understand but unable to understand. For example, teaching department 5 Practice book 35