Children play at the 9th toy expo in Beijing, capital of China, July 12, 2018. The four-day expo kicked off here Thursday at the National Agriculture Exhibition Center. (Xinhua/Luo Xiaoguang)

A little girl plays with Lego bricks at the 9th toy expo in Beijing, capital of China, July 12, 2018. The four-day expo kicked off here Thursday at the National Agriculture Exhibition Center. (Xinhua/Luo Xiaoguang)

Children play at the 9th toy expo in Beijing, capital of China, July 12, 2018. The four-day expo kicked off here Thursday at the National Agriculture Exhibition Center. (Xinhua/Zhang Chenlin)

A little boy plays with toys at the 9th toy expo in Beijing, capital of China, July 12, 2018. The four-day expo kicked off here Thursday at the National Agriculture Exhibition Center. (Xinhua/Luo Xiaoguang)

A little boy plays rugby at the 9th toy expo in Beijing, capital of China, July 12, 2018. The four-day expo kicked off here Thursday at the National Agriculture Exhibition Center. (Xinhua/Luo Xiaoguang)