Check out this group of old photos that record the great changes Suzhou New District in Jiangsu province has undergone since China's reform and opening-up 40 years ago.

Children used to compete on their school's rough racing track. [Photo/WeChat account: snd-szgxqfb]

Children now play chase on their school playground's green grass. [Photo/WeChat account: snd-szgxqfb]