资料来源 : pyDict

火山灰[水泥原料]

资料来源 : Webster's Revised Unabridged Dictionary (1913)

Pozzuolana \Poz`zu*o*la"na\, Pozzolana \Poz`zo*la"*na\, n. [It.]
   Volcanic ashes from Pozzuoli, in Italy, used in the
   manufacture of a kind of mortar which hardens under water.