今年换了一个工作环境,实验室的资源、周围的情况也有所改变,许多原来做熟的实验器材、所用的实验材料都随之发生了一些变化,凭着这么多年的自然教学经验,我胸有成竹地去上课,去做实验。然而我碰上了两个出乎意料的情况:第一,我在进行植物茎有输送水分的作用实验准备时,因为懒 This year changed a working environment, the resources of the laboratory, the surrounding situation has changed, many of the original well-cooked experimental equipment, the experimental materials used are subject to some changes, with so many years of natural teaching experience, I have a good deal of our own thought Go to class and do experiments. However, I ran into two unexpected situations: First, when I was experimenting with the role of plant stems in delivering water,