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单语范例（未经PONS编辑处理）
A hitherto unheard-of uncle needs help in his restaurant, so the whole family ups sticks.
en.wikipedia.org Clockwise circles are most common, but anticlockwise ones are far from unheard-of.
en.wikipedia.org The nighttime version initially drew in up to 30 million viewers a day three times a week, an unheard-of number in modern network television.
en.wikipedia.org He wrote the majority, instead, applied an unheard-of form of rational basis review that will have far-reaching implications beyond this case.
en.wikipedia.org These are real songs being performed by real musiciansan unheard-of process in todays world.
en.wikipedia.org