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By rolling out a health code system, the city could form "travel bubbles" with low-risk COVID-19 countries and regions faster, as it could serve as an "assurance" to the travelers' destinations, he added.

By leveraging computational microscopic imaging technologies, students developed algorithms that can reconstruct a high-resolution image based on a series of low-resolution images.

By the end of March, China's social security system has covered 1.12 billion citizens, or 80.6 percent of the total population, according to the ministry. The system has been widely used in medical services, elderly care and employment.

By the end of November, WeSure had become Wechat's most popular insurance mini program－a program that runs inside the Wechat app－with 20 million active users per month.

By the end of September, the China-Laos railway has completed all tunnel construction, installed rail tracks of 148 km which is one third of the railway, and ceiled the top of its first station in Nateuy.