corticoliberin

例句：

1. 1. The bone structure is composed of several layers, including the cortical and the medullary layers.
   骨骼结构由几层组成，包括皮质层和髓质层。
2. 2. The cortical layer is responsible for protecting the underlying tissue from injury.
   皮质层负责保护下面的组织免受损伤。
3. 3. The cortical layer is thinner than the medullary layer, which is why it is more susceptible to damage.
   皮质层比髓质层薄，这就是为什么它更容易受到损伤。