教学时我发现,一些学生做实验时不够细心,观察不够仔细,对实验材料也不够爱惜。我虽然多次给学生讲过相关的道理,引导学生克服这些毛病,但收效不大。我在备《动物的卵》一课时,看到教材上 When I was teaching, I found that some students were not careful enough to do the experiment, they did not observe it carefully and did not care enough about the experimental materials. Although I have repeatedly told students about the relevant truths to guide students to overcome these problems, they have not achieved much success. I prepared “animal's egg” a lesson, see the textbook