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在常识课的教材中,各年级都安排了与植物有关的教学内容。每当遇到这样的课,教师往往要提前采集,然而到上课时,这些植物都已枯萎,甚至干瘪了,教学效果大受影响。如果用压制好的植物标本,虽然可以随时取出来,比较方便,但缺点是压制后植物的叶绿素被破坏,时间一长,便失去了植物原有的颜色,没有了生气。当然也有用甲醛稀释成福尔马林溶液浸制的,可是甲醛有一股刺鼻、难闻的气味,对皮肤也有一定的腐蚀
In the common-sense textbooks, plant-related instruction is arranged in all grades. Whenever encountering such a lesson, teachers often have to collect them in advance, but by the time of class, these plants have withered or even shriveled, and the teaching effect greatly affected. If you use the pressed plant specimens, although you can always take it out, more convenient, but the disadvantage is that after the suppression of plant chlorophyll is destroyed, over time, they lose the original plant color, without getting angry. Of course, there are also formaldehyde diluted into formalin solution, but the formaldehyde has a pungent, bad smell, the skin also has some corrosion