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在生物教学中最好能使用实物讲授,但是有些实物是不易得到的,或者实物过小,或者像鲫鱼内脏那样,界限看不清楚等.因此,在进行观察实物之先,利用模型教学就非常必要了. 模型的优点很多:它是立体的,更现实些,在构造上和颜色上可以显示得很清楚,能够比实物大很多倍.这样的立体教具善于帮助说明问题,帮助学生理解实物.因此在中学里需要很多模型.但是在市场上购买价格很
In biological teaching, it is best to use physical lectures, but some physical objects are not easily available, or the physical objects are too small, or the boundaries are not as clear as the internal organs of carp. Therefore, before the observation of physical objects, the use of model teaching is very important. Necessary. Many advantages of the model: it is three-dimensional, more realistic, in the structure and color can be displayed clearly, can be many times larger than the real thing. Such three-dimensional teaching aids are good at helping to explain the problem, help students understand the real thing. Therefore, many models are needed in middle schools. However, the purchase price is very high in the market.