I can't describe these pictures in English clearly. Please help me. 今年6月，当我参观北京圆明园时，我看到一些图片，介绍圆明园中喷泉的工作原理，我当时震惊了，中国的古代没有电，没有水泵，怎样实现喷泉？ 谁能想象如此漂亮的喷泉，如此漂亮的建筑，里面竟然藏着一个人牵着一头驴在绕着柱子做圆周运动。一楼的齿轮与二楼的柱子同轴旋转，通过一对锥齿轮，将二楼的旋转运动转化为一楼相互垂直的旋转运动，带动了一楼曲柄旋转。曲柄旋转时，通过曲柄上的连杆带动活塞在气缸内上下往复运动，将一楼水池的水源源不断地抽吸入活塞，再压入二楼水池。再通过不同粗细的管子将二楼水池的水放出来，行成喷泉。不得不赞叹设计师的智慧。 On April this year, when I visited the Old Summer Palace in Beijing, I saw some pictures that introduced how the fountain working in Old Summer Palace. I was shocked. There were not electricity and pump, How to make a fountain? Who can imagine what a beautiful building and fountain, a donkey followed a person hiding in the seconditions floor made the beautiful fountain. What intelligent designers!