A teacher interacts with an autistic child in Xuzhou, East China's Jiangsu province, March 31, 2017. April 2 marks the World Autism Awareness Day. [Photo/Xinhua]

A staff shows a handiwork created by autistic children and their parents during a charity auction held for autistic children in Harbin, Northeast China's Heilongjiang province, March 31, 2017. April 2 marks the World Autism Awareness Day. [Photo/Xinhua]

Doctors and nurses attend a charity bazaar held for autistic children in a hospital in Hengshui, North China's Hebei province, March 31, 2017. April 2 marks the World Autism Awareness Day. [Photo/Xinhua]

A teacher interacts with an autistic child in Xuzhou, East China's Jiangsu province, March 31, 2017. April 2 marks the World Autism Awareness Day. [Photo/Xinhua]

People attend a charity bazzar held for autistic children in a hospital in Hengshui, North China's Hebei province, March 31, 2017. April 2 marks the World Autism Awareness Day.[Photo/Xinhua]

Photo shows a handiwork created by autistic children and their parents during a charity auction held for autistic children in Harbin, Northeast China's Heilongjiang province, March 31, 2017. April 2 marks the World Autism Awareness Day. [Photo/Xinhua]

Guests attend a launching ceremony of a fund for the autistic children in Beijing, March 31, 2017. April 2 marks the World Autism Awareness Day. [Photo/Xinhua]

Performers dance during a gala held for autistic children in Xining, capital of Northwest China's Qinghai province, March 31, 2017. April 2 marks the World Autism Awareness Day. [Photo/Xinhua]