...ertilizing，etc．；cultivate耕种；耕耘；耕作 : extending back beyond memory or record；ancient无法追忆的；无文字记载的；古老的 :．get or extract by force，threats，persistence，etc.; extort强求；榨取；勒索 .
Mostly folkliteratures don't have writtenrecords, ortheir ownbookstotest. It's adistinctiveway to becommunicated and continuedgenerations by mouth and heart.