名词
中文翻译：不明确的
同义词：
['unknown', 'undefined', 'unidentified']
例句：
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1. The scientist has yet to identify the cause of the disease.
科学家还未确定这种疾病的原因。
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2. The team is still searching for the missing person.
团队仍在寻找失踪的人。
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3. The situation remains unknown until further investigations are conducted.
直到进一步调查进行，情况仍然未知。