hair shaft cuticula

例句：

1. 1. The hair follicles on my head are very sensitive to the sun.
   我头上的头发毛囊对阳光非常敏感。
2. 2. The doctor removed the hair root and performed a biopsy.
   医生取出了毛囊并进行了活检。
3. 3. The hair follicles in the scalp are responsible for producing new hair cells.
   头皮上的毛囊负责产生新的毛发细胞。