A coarse hard sandstone used for making grindstones and millstones.
一种用来做磨石或石磨的粗而硬的砂石
The markings on the recovered tools suggest that they were used like grindstones and pestles for processing grains.
经过复原的石器上的痕迹显示他们被用来处理谷物。
The greatest cost variable is wear on the plates and grindstones, which machinists are constantly refacing.
最大的成本变数是重盘和砂轮的耗损，技工必须经常加以修整。
Caught in the twin grindstones of those pressures, Canada's publicly funded health-care system might not survive.
在奇迹和困难的双重压力下，加拿大的免费公共健保系统或许将不复存在。
They also found ochre, bone, charcoal, grindstones and hammer stones.
他们还找到了赭石，骨头，木炭，磨石和石锤。
They came only to work, collecting their hammer stones and grindstones nearby and the chunks of ocher from perhaps as far away as 12 miles.
这些工匠们只是来洞穴工作，在附近收集他们的锤石和磨石以及从可能远至12英里处采集大块的赭石。
Tabular layout of article characteristics - Part 129: Bonded abrasive segments, honing tools, abrasive bars and grindstones
制品特性图表.第129部分：粘合扇形研磨块、膛磨工具、砂棒和砂轮
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