形容词
中文翻译：无日期的
同义词：
['unmarked', 'unstamped', 'unrecorded例句：1. The report was undated', "so we couldn't determine its date of publication.（这份报告没有标注日期，所以我们无法确定它的出版日期。）2. The company's financial records were undated", 'making it difficult to trace their origins.（公司的财务记录没有标注日期，这使得追踪它们的来源变得困难。）']
例句：
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1. The report was undated, so we couldn't determine its date of publication.
这份报告没有标注日期，所以我们无法确定它的出版日期。
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2. The company's financial records were undated, making it difficult to trace their origins.
公司的财务记录没有标注日期，这使得追踪它们的来源变得困难。
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3. The artifacts were found in an undated tomb, suggesting that they had been there for centuries.
这些文物是在一座无日期的墓穴中发现的，这表明它们已经存在了几个世纪。