单词	前兆--前驱物
释义	前兆；前驱物precursor
随便看	data processing，dp data processor data processor--dp data processor，dp data process subsystem data product data product level data projector data proliferation data protection data protection act data protection act {=dpa} data protection act of 1984 data protection and security data protection authority data protection convention data protection directive data-protection printing data provider data punch data purging data purification data qualification data qualification and retrieval data quality