the inner ring line overpass 内环线高架
double ring line 双联环路
Thin Ring Line 细圆线
Shanghai Middle Ring Line 上海中环线
ring main cargo line system 环形货油总管系统
Manual Ring-Down Line 手动振铃线路
Virtual Line Switching Ring 虚拟线交换环
bidirectional line switched ring 双向线路交换环
signet ring cell line 印戒细胞系
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