not easy to see, hear, or understand
不清楚的;不明确的
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the motive for this killing is unclear .谋杀动机不明。
not obvious or definite; ambiguous
不明显的,不明朗的;含糊的
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their future remains unclear .他们前途未卜。
having or feeling doubt or confusion
怀疑的;茫然的
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users are still unclear about what middleware does .用户对中间件的作用仍有疑问。