n.穿孔；贯穿；针孔；齿孔 变形： 复数：perforations 英英释义： perforation[ ,pə:fə'reiʃən ]n.a line of small holes for tearing at a particular placea hole made in something"a perforation of the eardrum"the act of punching a hole (especially a row of holes as for ease of separat