下表面
拼音：xià biǎo miàn 英文解釋：
【醫】 lower surface; under surface例句：
- 有背腹性的象大多數葉子那樣扁平而有鮮明的上下表面的
Flattened and having distinct upper and lower surfaces, as most leaves do.
- 用濕布抹一下表面。
Sponge down the surface with a wet cloth
- AutoCAD環境下表面粗糙度的自動標註
Research for Automatic Marking Surface Roughness Based on AutoCAD
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