老师说明天要学习《长方形和正方形》,所以让我们做一个长方形和正方形。我一回到家就来到我的小天地,认真地剪下一个长方形,又剪下了一个正方形。就着桌上的台灯,我仔细观察起我的这两个新朋友。这时我惊奇地发现,长方形在灯光的映照下,在桌子上投射下了一个黑色的影子,仔细辨认长方形的影子竟然是一个平行四边形。这个发现让我如获 The teacher explained the day to learn “rectangle and square”, so let’s make a rectangle and a square. When I got home, I came to my little world, carefully cut a rectangle, but also cut a square. On the table lamp, I carefully observed my two new friends. At this moment I was surprised to find that the rectangle projected a black shadow on the table under the light, and the square shadow was carefully identified as a parallelogram. This discovery made me feel good