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。
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。
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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