对于那些懂得观察的人来说,植物并不是静止不动的,它们能够做一些缓慢而精确的运动。比如,植物的叶子会在一天当中随着太阳运行的轨迹变换位置:早上,叶子朝向东边,晚上则转向西边。动身去探索这个微妙又神秘的世界吧,不要害怕迷路,因为植物会为你指明方向。当一棵树被砍伐下来,树桩上年轮的图案可以为我们指示出南北方向。由于树木朝南的一面生长得更快,因而南面的年轮间距明显更大。利用树桩 For those who know how to observe, plants are not static, they can do some slow and precise exercise. For example, a plant's leaves change position in the course of the day as the sun moves: in the morning, the leaves face east, and at night turn west. Get out to explore this subtle and mysterious world, do not be afraid to get lost, because plants will show you the way. When a tree is cut down, the pattern of the annual rings on the stump can indicate the north-south direction for us. The annual ring spacing on the south is significantly greater due to the trees growing faster on the south side. Use stumps