incrustation
noun [ C ] uk/ˌɪn.krʌsˈteɪ.ʃən/ us/ˌɪn.krʌsˈteɪ.ʃən/ (also encrustation)
（积垢、化学物等）表层沉积物，凝结物
a layer of material, such as dirt or a chemical, that forms on something, especially slowly
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