The closely spaced tunnel is one of the feasible solutions for tunnel construction, which is an effective supplementary type for the separated tunnel.
小间距隧道是在特定地形条件下修建隧道的理想选择之一，在隧道建设中发挥了积极作用。
The closely spaced tunnel is one of the feasible solutions for tunnel construction, which is an effective supplementary type for the separated tunnel.
小间距隧道是在特定地形条件下修建隧道的理想选择之一，在隧道建设中发挥了积极作用。
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