- an unknown number
- 一个: one; a; an
- 未知数: unknown number unknown; unce ...
- 消去一个未知数: eliminate an unknown quantity
- 一个未知区域: an unknown region
- 未知数: 1.[数学] unknown number2.(不确定) unknown; uncertain 学院今年的春运会是否开还是个未知数。 it's still uncertain whether the college spring sports will be held this year
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