苦心研究;
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.
The handle of the hammer away easily.
这锤“柄”很容易脱落.
Took little hammer away from man in # 2 engine.
把小榔头从2 号 发动机那个人手里拿走.
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