穿孔线

perforation gauge───穿孔规

perforation gauges───穿孔规

demarcation line───[地理]分界线；划界线

perforating gun───[油气]射孔枪

perforating guns───射孔枪

perforation───n.穿孔；贯穿

perforations───n.[医]穿孔；孔眼；器官或身体某部位的裂口（perforation的复数）

This company has seamless steel pipe perforation unit production line two, cold draw production line six, hot rolling production line with welded steel pipe production line two.───本公司拥有无缝钢管穿孔机组生产线两条，冷拔生产线六条，热轧生产线一条和焊接钢管生产线两条。

with respect to continuous stationery, it is often four line spaces below the perforation line.───对于多页文书来说，通常在穿孔页缝以下空四行的位置。