tourmaline
音标:
英 ['tʊməlɪn]
美 ['tʊrməlɪn]
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tourmaline是什么意思

[化] 电气石
n. a mineral that is a complex borosilicate and hydroxide of aluminum containing iron and magnesium and calcium and lithium and sodium; it is usually black but occurs in transparent colored forms that are used as gemstones
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