总之，海军计划采购30艘新型潜艇使其有强大的水下作战能力。
In all, Navy plans to procure 30 new submarines to have formidable underwater fighting capabilities.
将近200年之后，在环游世界时，人们已经可以乘坐潜艇在水下一次呆上几个星期，潜艇的能量也几乎没有限制，其上还有能摧毁数座大型城市的武器。
Nearly 200 years later, men could remain underwater for weeks at a time while crossing the globe on a submarine with a nearly limitless supply of power and the means to destroy several large cities.
俄国通过派遣一艘潜艇在北极水下大约4公里处安置一面耐腐蚀的钛制旗子，表明其所有权。
And Russia has staked a claim by sending a submersible to plant a corrosion-resistant titanium flag some 4km below the North Pole.
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