The tables are fitted with a glass top to provide an even surface.
那些桌子都装有玻璃台面以提供平滑的表面。
《柯林斯英汉双解大词典》
2
A pitfall trap can be any small container placed in the ground with the top level with the surrounding surface and filled with a preservative.
陷阱可以是任何放置在地面上的小容器，其顶部与周围的表面齐平，并装满防腐剂。
3
If the glass were kept hot enough, it would flow over the molten tin until the topsurface was also flat, horizontal and perfectly parallel to the bottom surface.