HMS Astute is Royal Navy's most powerful attack submarine.

HMS是最有威力的，攻击性最强的皇家海军舰艇。

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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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South Korea will deploy two destroyers, a fast frigate, a patrol craft, P-3C aircraft from Carrier air Wing-Six and an attack submarine.

韩国将布署两艘驱逐舰、一艘快速护卫舰、一架来自于“奥斯威星号”航空母舰的P - 3c预警机以及一艘攻击型潜水艇。

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International investigators have blamed a North Korean submarine for the attack.

VOA: special.2010.05.29

The 97m (318ft)-long craft is the UK's newest nuclear-powered attack submarine and joined the Royal Navy fleet in August 2010.

BBC: Able Seaman Ryan Samuel Donovan

But it's worth remembering that this is the first attack submarine that British workers have built from scratch in nearly 40 years.

BBC: HMS Astute recovers from shaky start

Hagel also suggested that the Pentagon's five-year budget plan continues to plan for additional F-22 Raptor fighter jets and F-35 Joint Strike Fighters in the region, along with a fourth fast-attack submarine deployed to Guam.

NPR: Hagel Warns China On Cyberattacks