真空 zhēn kōng 🔊 vacuum HSK 7–9 + Review this word Meanings zhēn kōng (physics) vacuum(fig.) vacuum(slang) to not wear underwear Its characters 真zhēnreally; trulyHSK 1空kōngemptyHSK 4 Words with 真空 真空管 zhēn kōng guǎn vacuum tube; thermionic valve 真空泵 zhēn kōng bèng vacuum pump 政权真空 zhèng quán zhēn kōng power vacuum