单词：unknowns
n. 未知事件（unknown的复数）
n an unknown and unexplored region
n anyone who does not belong in the environment in which they are found
n a variable whose values are solutions of an equation
n anyone who does not belong in the environment in which they are found
n a variable whose values are solutions of an equation
unknowns的用法和样例：
例句
- He was an unknown painter one year ago.一年前，他还是一个不为人知的画家。
- The disease was practically unknown ten years ago but then it flared and spread like wild fire until it reached epidemic proportions.这种疾病10年前几乎无人知晓，可它突然爆发象野火般迅速传播，直至流行甚广。
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