The concept was originally applied to the Polaris submarine project.
这个概念首先应用在北极星潜艇项目上。
The U. S. first Polaris submarine, George Washington at Groton in Connecticut.
美国第一艘北极星潜水艇“乔治·华盛顿号”在康涅狄格州格罗顿下水。
The U. S. first Polaris submarine, George Washington, was launched at Groton in Connecticut.
美国第一艘北极星潜水艇“乔治·华盛顿号”在康涅狄格州格罗顿下水。
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