abrasive, abrasive material; grinding material
abrasive material, grinding material
grain material, grinding material, abrasive material, grinding media
"When one burns one's bridges, what a very nice fire it makes."
"Blessed is the man, who having nothing to say, abstains from giving wordy evidence of the fact."
"Patience is the companion of wisdom."
"We have, I fear, confused power with greatness."