第一种水桶的供水原理在简单不过了，学过初中物理的都知道。如瓶中的水之所以能倒出来是因为在倒水的同时有空气不断进入瓶中，只要瓶中的气压不小于瓶外的气压，水就，如果瓶中的气压小于瓶外的气压，水就会在瓶外的气压作用下阻止其流出。
The water supply principle of the first kind of bucket is simple enough, as you know from junior high school physics. If the water in the bottle can be poured out because there is air continuously entering the bottle wufangbu.07858.netxinban.07858.netlalijii.07858.netshiyanji.07858.netliuhuaji.07858.net liuhuajii.07858.netwhile pouring water, as long as the pressure in the bottle is not less than the pressure outside the bottle, water, if the pressure in the bottle is less than the pressure outside the bottle, water will prevent its outflow under the pressure outside the bottle.
只要控制流入瓶中的空气就能控制水的流出，而这个办法就是利用水自身的密封能力。
As long as the air flowing into the bottle is controlled, the water flow can be controlled by utilizing the sealing ability of the water itself.