refracting sound walls sound to merger into different regulation
refocusing is focalization. vocalizing is sound_emission. refractivity is not deflection. double_refraction is refraction. surface_noise is background_noise. audible_sound_or_sound_sequence is transfer. refocusing is not focalization. making_splashing_sound is not sound_emission. double_refraction is not refraction. vocalizing is not sound_emission.