邮票边缘的穿孔让它们可以轻松撕下。

The ___perforations along the stamp edges make them easy to tear off.

邮票边缘的小孔是为了方便撕开。

The small ___perforations along the edge of the stamp make it easy to tear.

邮票边缘的穿孔设计使它们更容易撕开。

The ___perforation along the edge of the stamps makes them easy to tear apart.