名词
中文翻译：未知
同义词：
['unknown', 'unknowns例句：1. The researchers found thatthe UNCHE was responsible for the disease.（研究人员发现，未知因素导致了这种疾病。）']
例句：
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1. The researchers found thatthe UNCHE was responsible for the disease.
研究人员发现，未知因素导致了这种疾病。
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2. The UNCHE is a complex system that requires carefulmanagement.
未知系统是一个复杂的系统，需要谨慎管理。
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3. The UNCHE is still being studiedby scientists around the world.
未知系统仍在全世界的科学家中进行研究。