英语语法分析

Ingrown toenails occur when the periungual skin is punctured.

刺穿趾周皮肤时会出现内生性脚趾甲。

Ingrown toenails occur when the periungual skin is punctured by its corresponding nail plate, resulting in a cascade of foreign body, inflammatory, infectious, and reparative processes.

内生性脚趾甲发生时，趾甲板刺破甲周的皮肤，导致一连串的异物，炎症，感染，和修复反应。