形容词
中文翻译：未知的
同义词：
['unidentified', 'unverified']
例句：
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1.The team's performance was unknown until the end of the game.
直到比赛结束，团队的表现才被确定。
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2. The scientist's findings were unknown to the public until recently.
科学家的发现直到最近才对公众公开。
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3.The identity of the culprit was unknown until the investigation began.
直到调查开始，罪犯的身份才被确定。