hammer away at

1 They were going at the job for all they were worth.

他们在尽最大努力做此事。

2 They have been hammering away at Comrade Yu for a few days, trying to change his mind.

他们几天来一直在努力做俞同志的工作，试图改变他的主意。

3 Millions were spent to hammer away at the sales resistance of voters.

花费数百万元以消除选民的反感.

4 All his recent letters hammer away at the questions of technical innovation.

他最近的一些来信都一再谈到技术革新问题.

1 努力干

buckle down to buckle down crack on with crack on

2 孜孜以求

persevere go the extra mile for go the extra mile

3 致力于

pursue work at devote to

4 努力做

endeavour

5 努力做某事

be at pains to do