短语词组短语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 返回 boat drill