unknowns

常见例句

• 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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