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Another potential risk challenging the sustainability of the US economy is the country's ballooning federal budget deficit.

Annual flying time has soared to 10.5 million hours, up from 6.19 million hours, over the past five years, with total number of civil planes increasing to 3,177 from 1,922, said Tang Weibin, an official with the CAAC.

Another example of these differences is that the gap in employment participation rates between men and women is narrowing in developing and developed countries while it continues to widen in emerging countries.

Another human resources executive, who also insisted on anonymity, said some businesses arrange health checkups with a chest X-ray before offering a job to a female candidate.

Another set of art is dough figurines made by Shi Zhenshan, a Chinese artist living in the US whose work features historical Chinese characters and National Basketball Association players as well as cartoon characters.