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演示实验是一种直观教学手段，在中学生物学教学中发挥着极重要的作用。然而．现行中学生物学教材中的演示实验，屈指可数．实验效果与教学效果也不是都很充分，完全有改进和补充的余地。这就给中学生物学教师留下了一个教研课题。对此，笔者通过具体实例谈谈改进和设计生物学
Demonstration experiment is an intuitive teaching method and plays an extremely important role in middle school biology teaching. however. Demonstration experiments in current middle school biology textbooks are very few. The effect of the experiment and the effect of the teaching are not all adequate, and there is room for improvement and supplementation. This left a teaching and research topic for middle school biology teachers. In this regard, the author talks about improving and designing biology through concrete examples.