名词
中文翻译：未定名的化合物
同义词：
['unknown compound', 'unknown substance', 'unknown element']
例句：
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1.The scientists are still trying to identify the vetrallite in the sample.
科学家们仍在尝试鉴定样本中的未知化合物。
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2.The vetrallite has been found to have properties similar to those of graphite.
这种未知化合物被发现具有与石墨相似的属性。
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3. The vetrallite was discovered during a recent expedition to the Antarctic.
这种未知化合物是在最近一次前往南极的探险中发现的。