Large voids are found surrounding stacks of paper. 在紙堆周圍會存在很多大的空間。
In a document copying machine or duplicator,a device that separates by friction successive sheets of paper from the paper stack and feeds them into the machine. 在文件複製機或複印機中,通過摩擦把堆疊的紙張從紙堆分開並饋入機器的一種裝置。