单词：lower surface
lower surface的用法和样例：
例句
- The stone is concave on both the upper and lower surfaces.冰壶石的上表面和下表面都是凹面。
- Light falling on a translucent surface is first absorbed beneath the surface, and then diffused in all directions.光落在半透明表面是第一被下表面吸收，并且扩散在所有的方向。
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