They had to post a signalman at the entrance to the tunnel.
他们不得不在隧道入口处安置一名信号员站岗。
This method can be applied in the other mining tunnel to select the appropriate supporting and then to be improved. It has advantages of low-cost, simplicity, high capacity of post-processing.
该分析方法可以运用于其他矿山巷道选择合适支护方式并加以分析改进，具有经济、简单、后处理能力强等优势。
This method can be applied in the other mining tunnel to select the appropriate supporting and then to be improved. It has advantages of low-cost, simplicity, high capacity of post-processing.
该分析方法可以运用于其他矿山巷道选择合适支护方式并加以分析改进，具有经济、简单、后处理能力强等优势。
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