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。
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。
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。
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。
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。
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