Day and night, railway workers crawl up 277 meters high to patrol over a major high-speed railway bridge in China's Guizhou to safeguard its safety. 责编:张靖雯 |
Day and night, railway workers crawl up 277 meters high to patrol over a major high-speed railway bridge in China's Guizhou to safeguard its safety. 责编:张靖雯 |