In order to improve the operating safety at tunnel entrance and exit zone, the alignment design at that zone was studied.
为提高公路隧道进出口区域的运行安全，对该区域的线形设计进行深入研究。
In order to improve the operating safety at tunnel entrance and exit zone, the alignment design at that zone was studied.
为提高公路隧道进出口区域的运行安全，对该区域的线形设计进行深入研究。
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