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在讲授人教社出版的九年制义务教育初中《生物》第一册 (上 )第六章第二节茎的结构时，我改变了实验九、实验十和实验十一的实验方法，尝试用美国中小学科学教程·实验系列《植物学实验》上的一个实验代替，实验效果非常明显：学生极易找到木质部，观察维管束的排列情况，分析?
In teaching the structure of stems in the second chapter of the sixth chapter of the nine-year compulsory education junior high school “Biology” published by the People’s Education Society, I changed the experimental methods of Experiment 9, Experiment 10, and Experiment 11 and tried Replaced by an experiment on the Botanical Experiments in American Science and Experiments series for primary and secondary schools, the experimental results are very obvious: students can easily find xylem, observe the arrangement of vascular bundles, and analyze?