spongy layer

基本解释

Results: Mandibular canal was formed by a thin layer of compact bone in spongy bone of mandibular bone.
结果：下颌管是下颌骨的骨松质内形成较薄的骨密质骨管。
The study's notion of a relatively warm, spongy ice layer beneath a thin, hard outer shell would also explain Titan's lack of major mountains.
薄而坚硬的外壳之下拥有一个相对温暖的海绵状冰层也解释了为什么在泰坦星上缺少较高的山峰。
An external layer of compact Bone surrounds a central area of spongy Bone, except at the marrow cavity.
骨的外层为质密的骨皮质，包围着海绵状骨松质中心区（不算骨髓腔）。