名词
中文翻译：未知字符
同义词：
['unidentified character', 'unknown entity', 'unidentified object']
例句：
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1. The researchers have identified severalunknown characters in the data.
研究人员已经识别出数据中的几个未知字符。
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2. The novel's plot is filled with unidentifiedcharacters that are difficult to decipher.
这部小说的情节充满了难以辨认的未知角色。
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3.In the movie, there are several unidentified characters who are not clearly defined.
电影中有几位未明确定义的未知角色。