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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