He used a hammer and chisel to chip away at the wall.

他用锤子和凿子将墙壁一点点凿掉。

《柯林斯英汉双解大词典》

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。

youdao

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。

youdao