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》

There was no wall of water, no howling winds; just the sound of taps drying up and toilets ceasing to flush.

没有滔天巨浪，也没有狂风大作；只有水龙头干涸和厕所无水冲刷所发出的声音。

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By the time he passed four thousand feet he had reached terminal velocity, the wind was a solid beating wall of sound against which he could move no faster.

他穿越四千英尺的高度时，已经达到极速，呼啸着的海风就像一堵坚实的墙，拦在前面，使他无法以更快的速度前进。

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Panels have been placed above the Turn 10 Sound Wall, the Main Grandstand, the administration office and the Raceway Cafe, as well as the Jim Russell Racing Drivers School building.

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As he stood over the ball I suddenly heard this wall of sound chanting "Beckham, Beckham, Beckham".

BBC: David Beckham (left) tangles with Owen Hargreaves

But on the contrabass trombone, you get this huge wall of sound .

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