rail pass是什么意思

用法例句

This paper expounds the present situation and improving scheme of the rail drill, discusses the developing process and field application of the rail drill, analyzes the test results of the rail drill, and introduces the improved rail drill.

阐述了钢轨钻孔机的现状与改进方案,论述了钢轨钻孔机的研制过程及现场应用,分析了钢轨钻孔机的测试结论,并介绍了改进型钢轨钻孔机。