Some examples of the types of injuries that can cause these spots are banging the finger on the door or banging it on the countertop or with a hammer.
导致这类斑点出现的指甲受伤类型包括指甲撞在门上或工作台上或被锤子砸到等。
Two men working on the door with a drill and a hammer made so much noise that concentration was very difficult.
两个在大门口用冲击钻和鎯头工作的工人制造出的噪音也让孩子们很难集中精力学习。
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