名词
中文翻译：Unknown
同义词：
['unclear', 'uncertain', 'ambiguous例句：1. The definition of the concept is still unclear to me.（这个概念的定义对我来说仍然不清楚。）']
例句：
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1. The definition of the concept is still unclear to me.
这个概念的定义对我来说仍然不清楚。
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2. The outcome of the experiment was uncertain.
实验的结果不确定。
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3. The situation is ambiguous, leaving room for interpretation.
情况含糊不清，有待解释。