zhēn​kōng HSK7

vacuum

真空 zhēn​kōng
vacuum noun
a space devoid of matter; a physical or metaphorical void

Scientists created a perfect vacuum environment in the laboratory.

commando noun
(slang) the state of wearing clothes without any underwear underneath

Frequency

Movie subtitles
2.12 per million appears in 1% of films
Written text
8.12 per million

Details

HSK 3.0
Level 7

Sources

Definitions
CC-CEDICT