美国人在南北战争时期,曾建造一艘奇特的潜艇,叫“享莱号”。它虽然享有“历史上第一艘击沉敌舰的潜艇”的盛誉,可它简直原始、简陋的可怜,“享莱号”由一个旧锅炉改建而成,没有什么先进的动力装置,而是由八个士兵,用人力转动曲柄轴来带动船尾的螺旋桨。静水航速每小时只有四英里。舱内更谈不上有什 During the Civil War, the United States once built a peculiar submarine called “Levin”. Although it enjoys the reputation of “the first submarine to sink an enemy ship in history,” it is so simple and primitive that it is poorly constructed. It has been converted from an old boiler without any advanced power unit. Instead, Eight sires propelled the aft propeller by manually rotating the crankshaft. Still water speed of only four miles per hour. Cabin even less about what