部署在欧洲水域之外的战舰数量差不多增加了一倍。The number of warships stationed outside European waters roughly doubled.一栋类似的房子位于城南部就要贵一倍的价钱。A comparable house in the south of the city would cost twice as much.出席会议的人数比预期的多一倍。Double the expected...

“一倍”的英语可以翻译为：one time ...