We shall hammer away at this problem till we get a solution.
我们将努力研究这个问题，直到找出一个解决办法。
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。
That lesson is not easy, but hammer away at it and you will get it right.
那课书不容易，但只要你坚持学，你是会学好的。
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。
He was chipping away at the rock with a hammer.
他在用铁锤把那块岩石一小块一小块地敲下来。
He was chipping away at the rock with a hammer.
他在用铁锤把那块岩石一小块一小块地敲下来。
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