A light, porous, glassy lava, used in solid form as an abrasive and in powdered form as a polish and an abrasive.
轻石，浮石一种在固体状时用作研磨物且粉状时用作磨光物和研磨物的轻多孔火山岩
She brushed away the darkness and saw him on the banks of a glassy river with a beautiful heifer standing near.
她拨开云层见到他正呆在一条明镜般的小河岸上，身旁有一头美丽的小母牛。
