A Simple Chord Offset Formula for Chord Offset Method in Setting-out of Concealed Excavation of Tunnels Curves and Optimum Offset Control Experiment是什么意思_A Simple Chord Offset Formula for Chord Offset Method in Setting-out of Concealed Excavation of Tunnels Curves and Optimum Offset Control Experiment在线翻译_英语_读音_用法_例句