意大利对于水果的分级,其一是按大小进行的,采用的是一条分级传送带。在这条带有孔眼的传送带上,从左到右,其孔径是可以变化的,孔径在最左边时,直径最小,传送带向右运行时,孔径也就随之增大,最右边孔经最大。也就是说,传送带上的孔眼,就象照相机的快门那样,可以变大变小。随着传送带的运行,孔径由小变大。果实最先落在传送带左边时,小的果实漏下 The classification of fruits in Italy is carried out by size, using a graduated conveyor belt. In this belt conveyor belt with holes, from left to right, the aperture can be changed, the diameter of the left when the smallest diameter of the conveyor belt to the right run, the aperture will also increase, the right-most hole by the largest . In other words, the eyelet on the belt, like the shutter of a camera, can become larger and smaller. With the conveyor running, the aperture from small to large. When the fruit first fell on the left side of the belt, the little fruit missed