一个周六下午科技兴趣小组活动快结束时,一个同学对老师说:“老师,我发现树叶落到地面上多数是背面向上,您知道这是怎么回事吗?”咦?这事我们平时可没注意到哦!老师建议我们再仔细观察一下,在校园外面的小树林里,我们果然发现落在地面上的叶子绝大多数都是背面向上的。我们又从 One Saturday afternoon at the end of the science and technology interest group activity, a classmate said to the teacher: “Teacher, I found that most of the leaves fall to the ground back up, do you know what’s going on?” We usually did not notice! Teacher suggested that we look carefully, in the woods outside the campus, we really found that most of the leaves falling on the ground are back-up. We are from again