NANJING, Oct. 24 (Xinhua) — The 2021 World Internet of Things (IoT) Exposition, China's top IoT event, kicked off Saturday in the city of Wuxi, east China's Jiangsu Province. The three-day event includes a summit, an exhibition featuring the latest IoT applications and products, and 10 forums focusing on themes like 5G, big data and intelligent transportation. The IoT industry has become one of the key industries for the development of the digital economy in China, with its scale exceeding 2.4 trillion yuan (about 375.8 billion U.S. dollars) by the end of 2020, said Wang Zhijun, vice minister of industry…