層級架構:
藝術與建築詞典根目錄
....關聯概念層面
........關聯概念
............<科學概念>
................<物理科學概念>
....................<物理學概念>
........................<聲學概念>
............................聲音 (聲學)
|||................................超音波
|||............................聲發射
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