perforations
n. [医]穿孔；孔眼；器官或身体某部位的裂口（perforation 的复数）
例句
The dangerous type chronic otitis media occurs with pars flaccida and marginal perforations.
慢性中耳炎的危险型可出现鼓膜松弛部的穿孔和鼓膜边缘性穿孔。
The rear perforations are visible on the cut edge.
后方齿孔都是看得见，对切缘。
There are limitations on the number and position of perforations allowed.
允许穿孔的数量和位置上有局限性。
