CHONGQING, Sept. 12 (Xinhua) -- As night fell, swarms of drones roared through a circular racetrack, while inside an exhibition hall humanoid robots sprinted, passed, and clashed in fierce contests.

In Lianhua Hill Park at the heart of Shenzhen, visitors can find patrolling robots, automated garbage-collecting boats, and an autonomous minibus. They can also enjoy drinks and take-out food delivere ...