拼音缩写是「ybty」的词

读音：yán bō tǎo yuán 繁体字：沿波討源 英语：trace the water and search for its source; follow up the stream and seek the source; make a thorough investigation of a thing 意思：1.谓循其流以求其源。喻深究事物之本末。语出晋陆机《文赋…