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Buying back stocks, which reduces the number of shares outstanding, is expected to improve the earnings per share ratio, because the company's annual earnings are then divided by a lower number of outstanding shares.

By Wednesday afternoon, the four high-risk areas were in Daxing and Fengtai districts. Xinfadi, the wholesale market to which all cases in the new cluster of infections are related, is located in Fengtai and is close to Daxing.

But some parents say those results are misleading because an outdated testing standard was used.

By 2018, China had 249 million people aged 60 and above, accounting for 17.9 percent of its total population, becoming a country with the largest and fastest-growing aged population in the world.

But there should be regulations to control excessive harvesting of pine nuts, and more funding and preferential policies from the central government are needed to speed up the recovery, he said.