n.齿孔，穿孔，穿通

原形：perforation复数：perforations

The letter had a small perforation in the corner where it could be easily torn open.
这封信的角落有一个小孔，可以轻易撕开。
The sheet of stamps had perforations along the edges for easy separation.
这张邮票纸张的边缘有齿孔，便于分开。
The bullet perforated the wall, leaving a visible hole.
子弹穿透了墙壁，留下了一个明显的洞。
The doctor warned that a perforated eardrum could lead to permanent hearing loss.
医生警告说，穿孔的耳膜可能导致永久性听力损失。
The patient required immediate surgery due to a perforated ulcer.
由于胃溃疡穿孔，病人需要立即手术。
The roof was perforated by a fallen tree during the storm.
暴风雨中，一棵倒下的树砸穿了屋顶。
The bullet narrowly missed him, leaving only a small perforation in his clothing.
子弹差点打中他，只在他的衣服上留下一个小孔。
The antique vase had a delicate perforation in the shape of a flower.
这个古董花瓶上有一个精致的花朵形状的孔洞。
The engineer used a perforated pipe to drain excess water from the garden.
工程师使用了有孔的管道来排出花园里多余的水。
The sheet metal was punched with a series of perforations for ventilation purposes.
为了通风，金属板被打上了许多孔。