现行全日制高中《生物》(必修)第一册(人教版)第58页对“渗透作用与水分的流动”的演示实验有如下叙述:“在一个长颈漏斗的漏斗口处密封上一层玻璃纸,往漏斗内注入蔗糖溶液,然后将漏斗浸入到盛有清水的烧杯中,使漏斗管内外液面的高度相等。过一段时间,观察漏斗内液面的高度是否发生了变化。想一想,这是为什么?” The current full-time high school “Biology” (required) Volume 1 (PEP) page 58 demonstration experiment on “permeation and moisture flow” is described as follows: “At the mouth of a long neck funnel Seal a layer of cellophane, inject sucrose solution into the funnel, and then immerse the funnel in a beaker filled with clean water, so that the height of the liquid inside and outside the funnel is equal. After some time, observe whether the height of the liquid level in the funnel has changed Think about it, why is this?”