我国是世界上最大的粮食生产国和消费国,近年来随着农业机械化水平大幅跃进,三大粮食作物耕种收综合机械化水平已经超过75%。随着粮食的连年丰收,产量也逐年递增,在我国,仅稻谷一项每年的产量便超过4000亿斤。大量、集中被收割 China is the largest grain producer and consumer in the world. In recent years, as the level of agricultural mechanization has greatly leaped forward, the mechanization level of the three major grain crops has totaled more than 75%. With the harvest of food year after year, the output has also been increasing year by year. In our country, the annual output of paddy alone exceeds 400 billion kilos. Mass, concentrated to be harvested