frigate

The Navy deployed a frigate to escort the merchant ships through the dangerous strait.

(Chinese) 海军部署了一艘护卫舰，护送商船通过危险海域。

Advanced sonar systems on the frigate allow it to detect submarines from miles away.

(Chinese) 这艘护卫舰上先进的声纳系统使其能够探测到几英里外的潜艇。