不断地做...

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.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....

hammer away at的音标：hammer away at的英式发音音标为：['hæmə ə'wei æt]hammer away at的美式发音音标为：['hæmɚ ə'we æt]...