Liu said it is important for China and Britain to adopt a global vision.
Liu Fuxue, deputy director of the CIIE Bureau, said on May 15 that 80 percent of the expo's exhibition area has already been reserved by exhibitors.
Liu He, a member of the Political Bureau of the Communist Party of China Central Committee, visited the US from February 27 to March 3.
Liu Yang, a Beijing-based lawyer who helped organize a lawsuit against such activities, said the auction and refusal to return the items to China "deeply hurts our nation's feelings".
Liu said the government needs to develop more sustainable financing channels to attract private capital to invest in public goods and solve the piling up of local government debts.
Liu Shili, who lives in Shenzhen, Guangdong province, runs a Chinese-language teaching channel on YouTube with her boyfriend in South Korea. In about a year, the channel-which targets South Korean learners-has gained nearly 150,000 subscribers.
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Liu made the remarks during the visit, in which he met with German Chancellor Angela Merkel and delivered a keynote speech at the closing ceremony of the 8th Hamburg Summit themed "China meets Europe".
Liu noted that given this background, the company added 1,000 units in its order from its previous purchase plan because of the "unexpected enthusiasm from consumers after the latest policy was announced."
Liu Xin, chairman and general manager of Migu, China Mobile's digital content unit, said at the convention that the rapid development of 5G will lead to profound changes in production and lifestyles as well as new development of audiovisual media technologies, including more diversified forms of media communication, more convenient production of media content and greatly expanded media communication channels. Aside from audiovisual companies like Xigua and Bilibili, text and picture-based content creation companies like Weibo and Zhihu are also stepping up efforts to develop products to expand user bases.