To get there they had to chisel away a concrete cell wall, and, of course, it had to be done slowly and on the QT.

为了到达这个通风口，他们必须凿穿一堵混凝土墙，当然，必须缓慢而秘密地进行这个工作。

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The Fed's aggressive stance will chisel away at the dollar, helping to narrow America's trade deficit and boost growth.

美联储这一强势立场会导致美元贬值，有望扭转美国的贸易逆差，拉动国内经济增长。

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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》

It was a question profound -- it was a profound question about how we recognize the potential within each of us, and chisel away at what's keeping it locked inside.

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Not wanting to damage the holes themselves, they used a chisel to chip away rock samples from a chimney-like tunnel that connects two of the depressions.

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For the better part of a day, I chipped away at the wall, blistering my hands and flattening the head of the chisel until it looked like a mushroom.

CNN: How I brought down the Berlin Wall