Photo taken on Sept. 6, 2019 shows a color Doppler ultrasound machine on display during an "Internet plus healthcare" exhibition of the ongoing fourth China-Arab States Expo in Yinchuan, northwest China's Ningxia Hui Autonomous Region. Held as part of the fourth China-Arab States Expo, the event showcases the latest technological developments by Chinese and international exhibitors in the smart healthcare industry. (Xinhua/Feng Kaihua)