grind away
发出摩擦之声, 刻苦地学习
例句与用法：
The steps have been ground away by the passing feet of many visitors over the centuries.
这些台阶经过许多世纪众多游客的足踏，已经磨损。
Grinding for a test; grinding away at housework.
为考试埋头苦读; 埋头做家务
词形变化：
副词: grindingly | 动词过去式: ground | 动词过去分词: ground | 动词现在分词: grinding | 动词第三人称单数: grinds |