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。

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Over the past two years, it has deployed at least one of a new type of nuclear-powered ballistic-missile submarine called the Jin class and it may deploy as many as five more.

在过去的两年里，它开发出至少一种新型的核动力弹道导弹潜艇，称为“晋”级，并且可能开发出大约五种以上。

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India is expected to launch a locally built nuclear - powered submarine this month.

印度一艘国产核动力潜艇预计将于本月下水。

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In nineteen fifty-one, Navy Admiral Hyman Rickover urged the United States Congress to provide money for the first nuclear-powered submarine.

VOA: special.2010.06.11

In nineteen sixty, Nautilus was deployed to the Mediterranean Sea to become the first nuclear-powered submarine in the United States Sixth Fleet.

VOA: special.2010.06.11

But by nineteen seventy-nine, the world's first nuclear-powered submarine had become an old ship.

VOA: special.2010.06.11

India has taken possession of a nuclear-powered submarine from Russia on a 10-year lease, Indian media say.

BBC: India leases Russian nuclear submarine

In October 2010, the Anglian Prince went to the aid of the nuclear-powered submarine HMS Astute after it grounded off Skye.

BBC: Three-month extension' for Scotland's coastguard tugs

Similarly, Brazil's arms build-up, which includes plans for a nuclear-powered submarine and new jet fighters, has not alarmed its neighbours much.

ECONOMIST: South American defence