trass
træs
基本解释
n. 火山灰
英文释义
n. A white to gray volcanic tufa, formed of decomposed
trachytic cinders; -- sometimes used as a cement. Hence, a coarse sort
of plaster or mortar, durable in water, and used to line cisterns and
other reservoirs of water.
上一个单词：traskite
下一个单词：traster