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单语范例（未经PONS编辑处理）
As such, it was never sold, or even got beyond the prototype phase.
en.wikipedia.org The term may also refer to a prototype for a video game, film, or any other type of media.
en.wikipedia.org The plan was dropped, however, after the prototype crashed after it had taken off.
en.wikipedia.org The team must both prototype and produce a tangible result.
en.wikipedia.org For these tests the original two prototypes were used.
en.wikipedia.org