He surmises that it was their slash-and-burn type of agriculture, which is particularly prodigal of land, that drove the people of the coast to seek more land in the islands to the south.
他認為，由於這個說南島語、以稻米為主食的民族，採取極浪費天然資源的「山田燒墾」（Slash-and-burn）的耕作方式，迫使他們不斷地由中國長江地區往南遷徙。