上皮细胞具有明显的极性(polarity) 游离面(free surface)：朝向身体表面或空腔器官的腔面 基底面 ( basal surface )：朝向深部附着于基膜 3.大都无血管 4.
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Objective: This study discusses the relation between the rubbed state of basal surface of removable denturecasting framework and oral hygene.
目的：探讨可摘局部义齿铸造支架组织面研磨状况与口腔组织健康之间的关系。
Its sedimentary structure includes large-scale inclined beddings, trough cross-beddings, low-angle cross-beddings as well as an erosional basal surface.
具有大型单斜层理、槽状交错层理和低角度交错层理，底部具冲刷面；
Pillow structure consists of a suit of deformed concave upward bodies made of silt and sand whose original layering bent round parallel the basal surface and it truncated at the top surface.
枕状构造是砂层中一组呈“凹”形弯曲的变形沉积体，它的原始层平行于枕状体的底面，顶面则是一个平直的截切面。
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