分别为上下底面积 Fo
分段下面拉底 [矿业] undermining sublevel
在下面/底下 on the bottom
柱子下面的底座或基石 column base
海底下面 After Benth
凸缘为环形结构，凸缘贴合在桌子上表面或者下底面。
The annular flange closely contacts the upper surface or underside of the table.
此架车机在其支撑的下底面设置用以平衡意外水平力和具有耐挤压性能的弹性支撑垫。
The supported lower bottom of the car lifter is provided with an elastic support pad for balancing accident horizontal force, wherein the elastic support pad has extrusion-resistant performance.
这种显微技术采用棱镜波导耦合结构，在棱镜下底面依次镀有金属膜-波导层-样品层。
The structure consists of a coupling prism and 3-layer film coated on the bottom of prism in proper order.
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