未知数 wèizhīshù unknown number
unknown number; (figuratively) an unknown; an uncertainty
How to remember 未知数: 未 not yet + 知 know + 数 number = unknown number.
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How it is used
- 'Unknown (quantity)' - 结果还是个未知数 (jiéguǒ háishì ge wèizhīshù) the outcome is still up in the air.
- Literally a math 'unknown', but mostly figurative for an uncertain matter.
- Common way to say the future or result can't yet be predicted.