‘This new first-tier city’s subway has finally gotten off the ‘single’ list’ is a playful internet phrase using personification to humorously describe a city that previously had only one metro line—hence ‘single’—and has now opened a second, thus ‘finding a partner.’ In China, the number of metro lines is often seen as a key indicator of a city’s scale and modernization. For years, several so-called ‘new first-tier cities’ like Hefei, Fuzhou, and Nanning operated with just a single metro line, earning them the nickname ‘single-line subways’ online. As these cities grew in population and economic strength, they gradually launched second—and even third—lines, marking a significant upgrade in their public transit systems. For instance, Hefei opened Line 2 in late 2017, ending its era of single-line operation; Fuzhou followed suit with Line 2 in 2019. This ‘coming off the single list’ symbolizes more than just improved transportation—it reflects broader advancements in urban vitality, demographic appeal, and infrastructure capacity. Today, an increasing number of new first-tier cities are transitioning from the ‘single-line era’ into a ‘multi-line network era,’ offering residents more convenient and efficient mobility while supporting high-quality urban development.
‘这座新一线城市的地铁终于脱单了’是一句网络流行语，用拟人化的方式调侃某座新一线城市此前只有一条地铁线路（‘单身’），如今新增第二条线路，实现‘脱单’。在中国城市轨道交通发展中，‘有无多条地铁线’常被视为衡量城市规模与现代化水平的重要指标。过去，部分新一线城市如合肥、福州、南宁等，在很长一段时间内仅拥有一条地铁线路，被网友戏称为‘单身地铁’。随着城市发展和人口增长，这些城市陆续开通第二条甚至更多线路，标志着其公共交通体系迈入新阶段。例如，合肥地铁2号线于2017年底开通，结束了‘单线运营’历史；福州也在2019年迎来地铁2号线。这种‘脱单’不仅是交通升级的体现，更折射出城市经济活力、人口吸引力和基础设施建设能力的全面提升。如今，越来越多的新一线城市正从‘单线时代’迈向‘线网时代’，为居民提供更便捷高效的出行选择，也助力城市高质量发展。
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