n.下侧;下部表面;底面;阴暗面;
英文例句/中文翻译:
...the underside of the eyelid.
眼睑内侧
The leaves are green on top and silvery on the underside.
那些叶子正面是绿色的,反面是银色的。
The underside of the rock was covered with seaweed.
岩石的下面布满了海草.