名词
中文翻译：不明确的
同义词：
['unknown', 'undefined', 'unidentified']
例句：
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1. The BM was a significant factor in the company's success.
BM是公司成功的关键因素。
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2. The BM is still under investigation.
BM仍在调查中。
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3. The BM has been identified as a potential source of contamination.
BM已被确定为潜在的污染源。