unknowns

常见例句

• He was an unknown painter one year ago.
  一年前，他還是一個不爲人知的畫家。
• 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。
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