...红宝石级的七年，不过比起号称在整个服役生涯均无须更换燃料棒的美国维吉尼亚级（Vigernia class）、英国机敏级（Astute class）核能攻击潜艇的25~30年逊色甚多，这可能是由于K-15反应器配合使用商用反应器的燃料，而无法刻意提高燃料中的铀成分比例。
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astute class
“机敏”级
以上为机器翻译结果，长、整句建议使用 人工翻译 。
Audacious is the fourth of the seven Astute Class submarines being built for the Royal Navy.
BBC: HMS Audacious: MoD announces ?1.2bn submarine contract
On paper, at least, the Astute class is a significant step forward.
BBC: HMS Astute recovers from shaky start
The ongoing revamp is timed to coincide with the arrival in 2009 of the new Astute class of hunter killer submarines, currently being built at Barrow-in-Furness in Cumbria.
BBC: NEWS | UK | Scotland | Glasgow and West | Sailors move in to ?125m quarters
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