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分析了手信号标象自然环境和识别环境，并作了观察者俯视角的敏感度和安全性分析，然后对《铁路技术管理规程》中关于一、四道夜间手信号的条款提出修改意见。
After analyzing the natural environment and identifying the environment of the hand signals, the author analyzes the sensitivity and safety of the observer looking downwards, and then proposes the amendments to the article about one or four night hand signals in the Railway Technical Management Regulations.