Britain has started work on a new fleet of nuclear-powered attack submarines that are likely to enter service towards the middle of the century, days after signing a new defence accord with Australia and the US to help Canberra acquire similar vessels.
英国已开始设计新一代核动力攻击潜艇，这支潜艇舰队很可能在本世纪中叶成军。近日，英国刚与澳大利亚和美国签署一项新的防务协议，内容包括帮助堪培拉方面获得同类型潜艇。
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