They also found ochre , bone , charcoal , grindstones and hammerstones .

他们还发现了赭石、骨头、木炭、研磨石和石锤。

Ear I often hear words or advice unpleasant things in mind often whisk heart is the jinde practice of grindstones .

耳口常闻逆耳之言，心中常有拂心之事，才是进德修行的砥石。

Challenges in human affairs are like grindstones that hone our wisdom and bring out our courage and perseverance .

人事的艰难是智慧的磨刀石，勇气和毅力也因之而生。