block of punch pins 穿孔针块
They are: keep the documents in chronological order, remove all the chips and pins, punch the documents evenly and place them in the folder.
它们是：按时间先后顺序排好这些文件，去掉所有的碎片和大头针，将文件对齐订好，然后放进文件夹。
Register pins: Pins which locate in holes made by a punch in a punch register system.
定位打孔机：应用于打孔定位系统内的精密打孔机。
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