A visitor tries an audio library during the Smart China Expo in Chongqing, southwest China, Aug. 26, 2019. The 2019 Smart China Expo (SCE) is held from Aug. 26 to Aug. 29 in Chongqing International Expo Center. Themed "Smart technology: empowering the economy, enriching life", the expo consists of various conferences, exhibition, contests and forums. (Xinhua/Tang Yi)