anyone who does not belong in the environment in which they are found
a variable whose values are solutions of an equation
造句
He was an unknown painter one year ago. 一年前，他還是一個不為人知的畫家。
The disease was practically unknown ten years ago but then it flared and spread like wild fire until it reached epidemic proportions. 這種疾病10年前幾乎無人知曉，可它突然爆發象野火般迅速傳播，直至流行甚廣。
近義反義詞
unknown
unknown risk
unknown unit
unknown fact
unknown area
unknown peak
unknown fever
unknown state
unknown terms
unknown cause
Unknown error