真空

zhēnkōng

HSK 7

真空 — zhēnkōng

1. vacuum (physics); figuratively, an empty space with no matter

   物理上，真空是指没有物质存在的空间。 wùlǐ shàng zhēnkōng shì zhǐ méiyǒu wùzhì cúnzài de kōngjiān — In physics, a vacuum refers to a space where no matter exists.

2. (slang) to go out without wearing underwear

   他今天竟然真空出门了，大家都笑翻了。 tā jīntiān jìngrán zhēnkōng chūmén le dàjiā dōu xiào fān le — He actually went out without underwear today; everyone burst out laughing.