An acoustic shadow is an area through which sound waves fail to propagate, due to topographical obstructions or disruption of the waves via phenomena such as wind currents. As one website refers to it, "an acoustic shadow is to sound what a mirage is to light".

1. The building created an acoustic shadow, making it difficult to hear the speaker.
   建筑物形成了聲影，使得聽(tīng)眾難以聽(tīng)到演講者的聲音。
2. In medical imaging, an acoustic shadow can indicate the presence of a solid object.
   在醫(yī)學(xué)成像中，聲影可能表明有固體物體的存在。