周后，冒出了两公厘宽的臼齿牙冠，具有牙髓腔、牙根的根尖、一层如骨骼般的象牙质，以及最基本的珐琅质。
Thirty weeks later two-millimeter-wide molar crowns emerged complete with pulp chambers root tips and bonelike layers of dentin and in a first enamel.
晚期脑损伤足月儿以脑实质内囊腔样改变和脑萎缩改变为主，早产儿以脑室周匿白质软化为主。
Brain injury in late period term infants mainly had cystoid alteration and atrophy in brain substance while preterm infants had mainly white matter malacia surrounding the brain ventricle.
本文还讨论了细菌周膜断裂面上颗粒密度不同的原因及腔中管泡状结构的来源。
This paper discussed the cause of distinction of the particle density and the orgin of tubular and vesicular structure in spaces.
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