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单词 θ217138
释义
society > occupation and work > materials > derived or manufactured material > other manufactured or derived materials > [noun] > from minerals (3)
rockwool1816

any of various fine matted fibrous materials consisting of or made from mineral matter, and used esp. in thermal insulation or soundproofing; cf. m

ambroid1887

A material formed by joining small pieces of amber and other resins together by means of pressure and heat.

alundum1903

A proprietary name for: a hard, heat-resistant material produced by fusing alumina in an electric furnace, used chiefly as an abrasive agent.

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