一潜水员在水下呼吸一直都离不开氧气瓶。这种方法有许多弊端:一是往氧气瓶里压缩输入氧气既昂贵又危险,二是氧气瓶重量往往会影响潜水员在水中的平衡。人们一直在寻找水下呼吸的新方法。鱼类呼吸时并不将水里的氧和氢进行化学分离,而是利用了水中的溶解空气。根据这种现象,以色列发明家阿隆·博德纳设想制造一个机械装置,使潜 A diver can’t leave an oxygen cylinder until he breathes underwater. There are many drawbacks to this method: First, it is expensive and dangerous to compress the oxygen in the oxygen bottle. Second, the weight of the oxygen bottle often affects the diver’s balance in the water. People are always looking for new ways to breathe underwater. Instead of chemically separating the oxygen and hydrogen from the water, the fish uses the dissolved air in the water. According to this phenomenon, the Israeli inventor Aaron Bodner conceives of creating a mechanical device that makes potential