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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这一方式适合基底面积较大的大型假山。
This way is suitable for the base area of the large rockery.
介质层具有镜反射半透明表面和漫射基底面。
The semitransparent and specular emerging surface of the medium layer was parallel to an opaque and diffuse substrate wall.
左边溃疡基底面缺少鳞状上皮仅存有坏死的碎片。
The ulcer base at the left shows loss of overlying squamous epithelium with only necrotic debris remaining.
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