Of course, I can also be material in the existing noise wall surface treatment.

当然，我的材料也可以在现有的墙体表面进行隔音处理。

youdao

Of course it will also effect the freq. 's, and the reflected sound we'll be different then before it hit the surface, although some material have less of a impact on the sound.

当然反射也是会影响到声音的频率，声音被反射的前后对照，是有不同的，尽管一些材料对声音的影响很小。

youdao