Every year, we spend billions of dollars, keeping a fleet of nuclear submarines permanently patrolling the oceans to protect us from a threat that almost certainly will never happen.
每年我们花费数十亿美元， 以维持核潜艇舰队， 在海洋中持续巡逻， 而这支舰队所预防的威胁， 几乎可以肯定绝不会出现。