读了一段关与XRD图谱阐释的文献，有些不解，望高人指点。。。
“A broad band indicating the presence of amorphous materials could be observed between 20 and 30 in XRD patterns . Therefore, it can be said that there are amorphous materials in the structure of fine aggregates.”
什么是“ broad band ”？有神马道理所在吗？
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雪山帅狼
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