手资料 第二手资料( Secondary Data) 是指别人就别的 目的先前已收集好的资料 secondary data has previously been gathered by someone other than the researcher and/or for some other purpose than the research project at hand 二手资料的增长速度很快二手资料 第二手资料（Secondary Data）——是指别人就别的 目的先前已收集好的资料。 secondary data has previously been gathered by someone other than the researcher and/or for some other purpose than the research project at hand 二手资料的增长速度很快