Boat rock drill钻岩船
charter boat drill救生演习
brear end boat drill救生演习
boat drill signal救生演习信号
Evacuation and Boat Drill撤离和救生艇演习
life boat drill沉船法则
drill boat钻探船;钻探船教练船;教练艇
Rock drill boat钻岩船
drill l boat钻探船
N（名词） practice in launching the lifeboats and taking off the passengers and crew of a ship 救生艇演习