1、努力做
... hammer 锤，榔头v锤击，敲打 hammer away at 努力做 hammer out 竭力想出(解决办法等) ...
2、不懈地致力于
...go on at总是责备,缠着hammer away at不懈地致力于keep on at对…纠缠不休；不断催促，不停地困扰；对…责骂不休；不迁离（某处）；继续雇用（某人） ...
3、反复强调
hammer away at vtr (attempt to accomplish sth by repeated efforts) 一直努力做 hammer away at 反复强调 hide away 藏起，躲起，隐藏 ..