surface

/ˈsərfəs/

the outer boundary of an artifact or a material layer constituting or resembling such a boundary

中文释义：表面；表层

The surface of the lake was perfectly still at dawn.

黎明时分，湖面平静如镜。

Scratches on the surface of the table indicate heavy use.

桌子表面的划痕表明使用频繁。