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Anne Zink, Alaska's chief medical officer, said the passengers were excited to be back on American soil.

Apart from supporting major environmental projects, China also resorted to environmental economic policy to steer businesses toward sustainable growth, unveiling a plan in December to establish a national green development fund in 2020.

Another area of great interest to Mackerras has been China's ethnic groups, which he has written about extensively. In particular, he has taken a great interest in the Uygurs in Northwest China.

Another new growth engine, derived from the collaboration between Macao and Zhuhai, a city in Guangdong province, is the traditional Chinese medicine business, Zhou said.

Anti-vaccine campaigners in the United States have come out in force against the three coronavirus vaccines that have proven effective in trials, amid a worsening pandemic that has killed more than 270,000 Americans and infected more than 13,7 million.