trass

听听怎么读
英 [træs]
美 [træs]
是什么意思
  • n.

    火山土;

  • 英英释义

    Trass

    • Trass is the local name of a volcanic tuff occurring in the Eifel, where it is worked for hydraulic mortar. It is a grey or cream-coloured fragmental rock, largely composed of pumiceous dust, and may be regarded as a trachytic tuff.

    以上来源于:Wikipedia

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