Fire drills will be conducted in your residence hall every semester.
每学期在你的宿舍楼都会进行消防演习。
2
It's the mother of all disaster drills for what could be the worst disaster in American history.
这是美国历史上最严重的灾难演习之“母”。
3
The cordless, hand-held tools we use in our homes, such as vacuum cleaners, flashlights, drills and saws came from the technology of these early space programs.