burrstone是什么意思

n.粗刻边,钻器

1. The mill's burrstones were used to grind wheat into flour.
(磨坊的磨轮砂岩被用来将小麦磨成面粉。)
2. The burrstone grinder made a loud noise as it crushed the coffee beans.
(磨轮捣碎机在碾碎咖啡豆时发出巨大的声音。)

1. 磨轮砂岩；2. 磨轮捣碎机