shallop小型战船
coastguardcutter,coastguardvessel巡逻艇,缉私艇
revenuecutter缉私船
patrolboat巡逻艇
minelayer布雷艇
minesweeper扫雷艇
torpedoboat鱼雷艇
frigate轻护航舰
gunboat炮舰
submarine潜水艇