層級架構:
藝術與建築詞典根目錄
....材料層面
........材料 (材料層面)
............材料
................<依成分區分之材料>
....................無機材料
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............................<鈉與鈉化合物>
|||................................碳酸鈉
|||................................氯化鈉
|||................................氫氧化鈉
|||........................
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