It must be processed through methods like boiling, grinding or fermenting.

VOA: special.2010.06.08

And the first year of law school was notorious for being difficult and grinding, you know, it was like that.

法学院的第一年是众所周知的——课程很难，让人难以忍受。

哥伦比亚的氛围 - SpeakingMax英语口语达人

Grinding up trees,houses,boulders, locomotives,humans, and animals in its path, it slammed into Johnstown, pulverizing the center of town.

VOA: standard.2010.04.26

He takes a moment between sales and grinding coffee to reflect on his wife and small children.

VOA: standard.2010.02.13

Elvis continued to have success in the 1970s, but his abusive drug habit and a grinding tour schedule soon caught up with him.

VOA: standard.2010.04.30

But,she warns this progress is fragile. She says the momentum for health development could come to a grinding halt because of problems stemming from the food and financial crises, the changing climate and the H1N1 influenza pandemic.

VOA: standard.2009.12.29