中学动物学课本(174面第5行)上说:“鸡蛋的硬壳主要是由石灰质构成的.壳上有许多小孔,叫作气孔,可以流通空气。壳上的小孔约有七千个”.怎样使学生理解这个问题,掌握贮藏鸡蛋的技术呢?我是这样作的: 先取一个鸡蛋,用针在它的一端刺一小孔;然后把注射器插入小孔,向内注入空气,这时鸡蛋壳内产生了力量相当 High school zoology textbook (line 174 on the 5th line) said: "The egg’s hard shell is mainly composed of lime, there are many holes on the shell, called the pores, the air can flow through. Shell holes about 7000 How to make the students understand the problem, to master the technology of storing eggs? I was like this: first take an egg, with a needle at its end a small hole; and then insert the syringe into the hole, inward into the air, At this moment, there is a lot of strength in the egg shell