Mural: Painting applied to and made integral with the surface of a wall or ceiling.

壁画：描绘在建筑物墙壁和天花板上并与其成为一体的绘画。

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There is a kind of rough wall surface, which is said to be sound-absorbing.

有一种墙面是麻的，据说可以吸音。

《新英汉大辞典》

16-12 Jerry dived, shot past the school of underwater swimmers, saw a black wall of rock looming at him, touched it, and bobbed up at once to the surface.

杰里跳入水中超过了一群水下的游泳者，看见一大块像墙一样的岩石正在回避他，他摸了摸，随即迅速浮上水面。

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More modern versions of the tool add in a laser beam projector, which allows builders to level out the device and "draw" a long line of light across a wall, indicating an exactly level surface.

FORBES: No. 18 The Level

The Wall Street Journal reported that sales of IdeaPaint, a paint product that turns a wall surface into a whiteboard, have doubled since 2008.

FORBES: The Outline Trap

On the surface this looks like another roundup of the usual Wall Street suspects involved in a white-collar crime, except for one thing, Ross Mandell is no usual suspect and he is not backing down from this fight.

FORBES: Forget The Galleon Group Trial(s) -- Sky Capital Will Be The Trial of 2011