patrol boat

名词 patrol boat:

1. a vessel assigned to patrol an area
   同义词：patrol ship

1. A police patrol boat hailed to us to come to.
   警察局的一艘巡逻艇招呼我们停下。
2. The patrol boat was ordered to stand by the sinking ship.
   巡逻艇奉命留在那快要沉没的船只附近，以便进行救助。