虹吸    

        把可移动的容器举到顶端，使水全部流出。再把它降下去。此时你将在不可移动较低的容器中看到喷泉。    当你把可移动容器升高时，水从里面流出，同时流入不可移动较高的容器中。当你把可移动容器降下时，不可移动较低的容器中的一些水流入可移动容器。这样就减小了不可移动较低的容器中的空气压力，从而把水从不可移动较高容器中吸出来。于是就在不可移动较低容器内形成了喷泉。

SYPHON    

        Lift the removable bottle to the top and let all the water run out of it. Lower the bottle to the bottom You see a fountain in the lower fixed bottle.    When you raise the removable bottle, the water ran out of it. And it flowed in to the higher fixed bottle. When you pulled the removable bottle down, some water from the lower fixed bottle flowed into it. This decreased the pressure in the lower fixed bottle. The water was sucked from the higher fixed bottle. So the fountain was forme.