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origin;source;background;antecedents;past history我不知道他有什么～。I don't know his background./查明～ascertain sb's antecedents;trace sth to its source/～不明的东西unidenfided object;things of uncertain origin(or dubious background)
英汉词典共收录311570条英汉翻译词条，基本覆盖所有常用英文单词的例句及中文翻译，是不可多得的英语学习材料。