美国航母有水下隐形群组伴随：至少一艘核动力攻击潜艇。
American carriers travel with an unseen companion: at least one nuclear-powered attack submarine.
美国旧金山号核动力攻击潜艇在发生致命事故以后，在严密的护航之下返回在关岛的基地。
A u. s. navy nuclear-powered attack submarine under heavy escort has arrived back at its home port of Guam after a fatal accident at sea.
中国人民解放军（PLA）海军操作的五艘091型（北约代号：汉级）核动力攻击潜艇在1967年至1990年之间由辽宁省的葫芦岛造船厂建造。
The PLA Navy operates five Type 091 (NATO codename: Han class) nuclear-powered attack submarines built by Huludao Shipyard in Liaoning Province between 1967 and 1990.
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