“grind away”的意思是“辛苦工作、刻苦认真地学”，常用于形容需要持续努力工作的情况。

【例句】
He has been grinding away at his novel for years, but it's still not finished.
他多年来一直在孜孜不倦地写他的小说，但仍未完成。

He has been grinding away at this project for weeks.
几个星期来，他一直在努力完成这个项目。