trass
英 [træs] 美 [træs]

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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