What is the fine-grained topic of the following text: BEIJING, Jan. 23 (Xinhua) -- Facial recognition, big data analysis, robot receptionists and Virtual Reality Panorama navigation -- as the 2019 Spring Festival Travel Rush kicked off on Monday, multiple smart technologies have been introduced across China to ensure all travelers safer and easier family reunion trips. Only return the topic.
Use of smart technologies in China's 2019 Spring Festival Travel Rush