(of an activity or a problem to be considered) isolated from the context normal to it and in which it can best be understood or assessed（需考虑的活动，问题）似在真空中；脱离现实
英语四级真题
Researchers can study the garbage left on the moon to see how its materials weathered the radiation and vacuum of space over time.
2018年12月四级真题（第二套）听力 Section C
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.
2017年12月四级真题（第二套）听力 Section C
英语六级真题
Surgeons may survive the robot invasion, but others at the hospital might not be so lucky, as iRobot, maker of the Roomba, a robot vacuum cleaner, has been showing off Ava, which could be used as a messenger in a hospital.
出自-2012年12月阅读原文
柯林斯高阶英汉双解学习词典释义
N-COUNT
空位;空缺;空白
If someone or something creates a vacuum, they leave a place or position which then needs to be filled by another person or thing.