dermomuscular sac

例句：

1. 1. The skin is the outermost layer of the body, providing protection and insulation.
   皮肤是身体的最外层，提供保护和绝缘。
2. 2. The dermomuscular sac is a protective structure that surrounds nerves and blood vessels.
   真皮肌肉囊是一个包围神经和血管的保护结构。
3. 3. During exercise, the dermomuscular sac helps to cushion the body from impact.
   在运动中，真皮肌肉囊有助于缓冲身体免受冲击。