Visitors look at a multi-functional intelligent robot at a robot fair in Harbin, capital of northeast China's Heilongjiang Province, July 27, 2016. The robot fair offered a platform for college students to showcase their talents on innovative machinery. (Xinhua/Wang Kai)

A robot made by college students is seen at a robot fair in Harbin, capital of northeast China's Heilongjiang Province, July 27, 2016. The robot fair offered a platform for college students to showcase their talents on innovative machinery. (Xinhua/Wang Kai)

A college student stands by his weeding robot at a robot fair in Harbin, capital of northeast China's Heilongjiang Province, July 27, 2016. The robot fair offered a platform for college students to showcase their talents on innovative machinery. (Xinhua/Wang Kai)

A young boy looks at a multi-functional robot made by college students during a robot fair in Harbin, capital of northeast China's Heilongjiang Province, July 27, 2016. The robot fair offered a platform for college students to showcase their talents on innovative machinery. (Xinhua/Wang Kai)

A cleaning robot made by college students is displayed at a robot fair in Harbin, capital of northeast China's Heilongjiang Province, July 27, 2016. The robot fair offered a platform for college students to showcase their talents on innovative machinery. (Xinhua/Wang Kai)