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China is willing to work with the United States to summarize the experience of 40 years of the development of China-US relations, and strengthen exchanges and cooperation in fields of economy and trade, military, law enforcement, anti-drug operations, local issues and culture, Xi said.

China launched the "toilet revolution" in 2015 to increase the number and sanitation of toilets at tourist sites. The campaign expanded to improve public toilets in cities and build better private toilets in rural areas.

China said the number of new cases has dropped sharply, and production is resuming in some locations.

China will continue to be a long-term popular destination for foreign investment, and the country welcomes enterprises from other countries to expand their cooperation and investment, Premier Li Keqiang said on Wednesday.

China said on Monday that it has suspended review of requests by United States military ships and aircraft to visit Hong Kong and also announced sanctions against several US non-governmental organizations in response to a Hong Kong-related US legislation.