petrosquamous fissure

例句：

1. 1. The petrosquamous structure of the skeleton is unique to this species.
   这种物种的骨骼结构是独特的。
2. 2. The petrosquamous bone was found in a fossilized dinosaur.
   在一具化石化的恐龙骨骼中发现了这种骨骼。
3. 3. The petrosquamous bone has been used in various medical treatments.
   这种骨骼已被用于各种医疗治疗。