铺设双轨；双轨行车的英文

• double tracking

• 铺设双轨:    lay a double-track
• 双轨:    double track two-way; dual
• 行车:    bridge crane
• 铺设双轨:    lay a double track
• 双轨:    1.[交通运输] double track2.two-way; dual◇双轨贸易 two-way trade; 双轨铁路 duorail; double-track railway; 双轨销售 dual distribution; 双轨枕 twin sleepers; twin ties