自古以来,面对飞速增长的人口,粮食产量对于我们这个以农业立国的大国来说,从来都是不敢稍有懈怠的事情。对整个人类而言,也同样如此。直到今天,这个世界依然没有完全解决困扰人类的粮食产量和人口增长之间的矛盾,很多人仍然处于忍饥挨饿的境地。先民的农业通常以刀耕火种、 Since ancient times, in the face of a rapidly growing population, food output has never been less slack for our big country that has established itself as an agriculture nation. The same is true of humanity as a whole. Until today, the world still fails to completely solve the contradiction between the food output and the population growth that plague human beings, and many people are still starving. The ancestral agriculture is usually slash-and-burn,