How are tunnels given a "health check"? How does a robotic dog "report for duty"? Ahead of this year's Spring Festival, outstanding local employees of China Railway Seventh Group from Ethiopia, Zambia, Uganda, and the Democratic Republic of the Congo were invited to visit the Qiaocheng East Road Tunnel Project in Shenzhen, where they experienced firsthand the technological prowess of China's infrastructure.

Arthur, a Ugandan who once studied in China, has now returned—and at the construction site, he unexpectedly met a new "colleague": a robot. Watch the video to see their encounter. (By Tong Lin and Ma Shaokun; Correspondent Chen Hai)

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Web editors: Shen Jianqi, Tong Lin