The perforations help you tear the paper neatly and easily.齿孔有助于轻松整齐地把纸撕开。Tear off the form along the perforations and send it to Sales.沿着纸孔撕下表格，寄给销售部。When held to the light the small oblong leaves are seen to possess tiny perforations.迎着光看时，就会发现椭圆形小叶子上有微小的孔眼。