粗石

Knives can be sharpened by grinding them against a rough stone.

刀能在一块粗石上磨快。

"The simplest stonework is rubBle, roughly Broken stones Bound in mortar. Ashlar work consists of regularly cut Blocks with squared edges."

最简单的石料加工品粗石,在研磨机中粗略的石头。石加工品由整齐切割出具缘之石块所组成。