过去我在讲动物学第一章家兔血液循环的时候,无论你如何按图反复讲解,学生所得到的概念,总是有些模糊不清。去年春天,我忽然想起用蝌蚪的尾部放在载玻片上(未用盖玻片)让它一度动弹而安静下来之后,置于一百二十倍的显微镜下观察,出乎意料之外,我看到了蝌蚪尾部薄膜上的血液循环,血液由尾动脉出来,通过薄膜组织,又由薄膜薄脉回到尾部中去,真像溪河中奔(?)澎湃的山洪一样,这突如其来的发现真使我们高兴极了. In the past when I talked about the blood circulation of rabbits in the first chapter of zoology, no matter how you explain them repeatedly, the concepts students get are always vague. Last spring, I suddenly remembered using the tail of a tadpole on a glass slide (without a cover slip) and allowing it to move once more and then quieting it down. Under a microscope with a hundred and twenty magnification, it was surprising that I I saw the tadpoles on the tail membrane blood circulation, blood from the tail artery out through the membrane tissue, but also by the thin film pulse back to the tail, really like the river in Ben (?) Surging torrents, the sudden discovery of true We are very happy.