上级党和政府号召我们勤俭办学,师生动手开动脑筋,克服教学困难,提高教学质量。学校领导开学初提出了加强教学的直观性,注意直观效果,帮助学生理解知识,运用自己获得的知识到生产实际中去。正当一年级进行茎的构造观察时,我们在课前准备好切片,但是不满足的是如果能将这些清楚的切片封闭起来,学生们上课观察多方便呢?可是这种稀少的加拿大树胶,从何处取得呢?我们抱定决心一定想出各种办法获得成功,终于试验成功,摸索到一种简单易作的封片法: The superior party and the government called us to be thrifty to run schools, teachers and students practicing their brains to overcome teaching difficulties and improve the quality of teaching. The beginning of the school leaders put forward to enhance the intuitive teaching, pay attention to the visual effects, to help students understand the knowledge, use their own knowledge gained in the production to go. While the first-grade stalks were observed for the structure of the stalk, we prepared the sketches before class, but not satisfied if it was more convenient for the students to go to class to see if they could be sealed. However, this rare Canadian gum, Where did we get it? We are determined to come up with all sorts of ways to be successful. We finally succeeded in testing and found a simple and easy method of sealing: