参考词典中unknown quantity的常规释义：
基本释义
参考例句
- We use x as the symbol for an unknown quantity.
我们用ｘ表示一个未知数。
英英解释
- a factor in a given situation whose bearing and importance is not apparent
[例]
- I don't know what the new man will do;
go
he's still an unknown quantity
- a variable whose values are solutions of an equation
[同]
unknown, unknown quantity
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