Fixed railway installations. Track service and maintenance tools. Sounding hammer.

铁路固定设备。轨道设施和维护工具。声检测锤。

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Silence across the room. A pen drops somewhere in the classroom, sounding like a hammer.

整个教室沉默。有支笔在教室的某个角落掉落，听起来象是铁锤。

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