acroterium

例句：

1. 1. The acroterium is the area around the neck where the skin folds over onto itself.
   颈褶区是颈部周围的皮肤折叠区域。
2. 2. The acroterium is often used as an alternative to the traditional cervical collar in orthopedic surgery.
   颈褶区在骨科手术中常被用作传统颈托的替代选择。
3. 3. The acroterium can be painful and cause discomfort during sleep.
   颈褶区可能会疼痛，并在睡眠时引起不适。