What are the sources of idioms?

Source book, source book, source book, source parallel wave, source flowing water, source poor flow, source new flow, homologous and heterogeneous, inexhaustible, reflux poor source, reflux from source, heterogeneous homology, poor wave source, wood water source, traceability, source knowledge from water, original source, reverse source traceability, continuous source, original. The source of teachers and friends, the source of extreme poverty, the source of origin, the source of everything, the source of endless traceability, the source of drinking, the source of family studies, the source of downstream, the source of clean, the source of upstream, the source of paradise, the source of upstream, the source of upstream, the source of traceability, the source of traceability, the source of saving money, the source of support, and the source of poverty. The same source, a long history, the original source, a long history, the same source and parallel flow, traceability, traceability, the original source, knowing the source of passive water and drinking water, the original source, the source, the downstream source, the source, the source, the source. Deep roots, forget the source of water, think about the source of drinking water, push the source from poverty, traceability, clean source, long source, traceability, exhausted source, poor source, source, traceability, source, source comes from itself, passive water, rootless wood, passive water, passive water.