When a sound source lies to one side of the head, the ear on the opposite side lies within the head's acoustic shadow.
当声源位于头部的一侧，另一侧的耳朵在头部的声影。
Results Among 21 cases presented hyperechogenic on ultrasonography. There were 18 cases with acoustic shadow and all calculi moved as position changed.
结果在21例睾丸鞘膜腔内结石的超声表现中，21例均为强光团，18例后伴声影，21例强光团均可移动。
Conclusion The major characteristics of calculi in the cavity of perididymis on ultrasonography are hyperechogenic with acoustic shadow and calculi moved as position changed.
结论强光团、后伴声影、可移动是睾丸鞘膜腔内结石的主要超声征像。
They noticed that acoustic waves were being generated along the edges of the moon's shadow, in a part of Earth's upper atmosphere known as the ionosphere.
他们注意到，在地球高层里称为电离层的那部分大气中，在沿着月球阴影的边缘上产生了声波。
They noticed that acoustic waves were being generated along the edges of the moon's shadow, in a part of Earth's upper atmosphere known as the ionosphere.
他们注意到，在地球高层里称为电离层的那部分大气中，在沿着月球阴影的边缘上产生了声波。
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