沿波討源沿流討源yán bō tǎo yuántrace the water and search for its source—trace the source according to the clues
? 如果你～，問題終究是會得到解決的。If you trace the source according to the clues,the problem will be solved eventually. 沿波討源yán bō tǎo yuán沿著水流尋找發(fā)源地。make a thorough investigation of a thing, trace the source according to the clues |