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。
Switch to the column properties and set the field usage type of all columns except the ones starting with DC to supplementary.
切换到Column properties并设置除用DC启动的所有列的字段使用类型为supplementary。
The type, scope and standards of supplementary insurances;
补充保险的种类、范围、标准；
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