zhè / sōu / zhàn dòu jiàn / zài / hǎi shàng / xún luó / shí / fā xiàn / le / bù míng / qián tǐng

这艘战斗舰在海上巡逻时发现了不明潜艇。

This battleship detected an unidentified submarine while patrolling at sea.