a boat that is on guard duty (as in a harbor) around a fleet of warships
双语例句
1
Fishermen meanwhile used them to recover lost nets and guardboats.
此外,当地渔民还利用水犬寻回遗失的渔具和保卫船只。
2
Rather, the captain, 41, had returned from 18 days in detention in Japan after his trawler collided with Japanese Coast Guardboats patrolling waters near rocky isles claimed by both China and Japan.
My route takes me alongside the harbour, past naval patrol vessels, Coast Guard ships, service boats for the offshore oil platforms and a surprising number of fishing boats.