American carriers travel with an unseen companion: at least one nuclear-powered attack submarine.

美国航母有水下隐形群组伴随：至少一艘核动力攻击潜艇。

youdao

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.

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。

youdao

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.

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。

youdao