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1·A safety clip or retainer must be installed to prevent attachments, such as chisels on a chipping hammer, from being unintentionally shot from the barrel.

必须安装保险夹或护圈，以防止配件(如气錾的凿刀)从凿筒中意外飞出。

2·Trembling with fear, they found an old man with a hammer and chisel, chipping away at one of the headstones.

正当两人害怕得浑身颤抖时，他们看到是个老头拿着铁锤和凿子，在一块墓石上凿着什么。

3·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。

4·Trembling with fear, they found an old man with a hammer and chisel 5, chipping away at one of the headstones.

正当两人害怕得浑身颤抖时，他们看到是个老头拿着铁锤和凿子，在一块墓石上凿着什么。