1PHRASAL VERB 不懈地致力(于);埋头(于) If you hammer away at a task or activity, you work at it constantly and with great energy. 不懈地致力(于);埋头(于)
Palmer kept hammering away at his report. [VERBPREP. + at]
帕尔默一直在埋头写报告。
2PHRASAL VERB (尤指因不赞成而)反复谈论(某观点或话题) If you hammer away at an idea or subject, you keep talking about it, especially because you disapprove of it. (尤指因不赞成而)反复谈论(某观点或话题)
They also hammered away at Labor's plans to raise taxes. [VERBPREP. + at]