trass

听听怎么读

英 [tr?s]

美 [tr?s]

是什么意思

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

学习怎么用

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