真空 zhēnkōng vacuum
(physics, fig.) vacuum; (slang) to not wear underwear
How to remember 真空: 真 truly + 空 empty = vacuum.
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How it is used
- A physics vacuum / empty space - 真空状态 (zhēnkōng zhuàngtài) a vacuum state; 真空包装 (zhēnkōng bāozhuāng) vacuum packing.
- Figuratively a void where something is absent: 权力真空 (quánlì zhēnkōng) a power vacuum.