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In terms of bilateral trade, the United States has been enjoying a trade surplus with Hong Kong over the years which has been the biggest among all its trading partners, the spokesman said.

Wang pointed out that the China-Africa friendship has weathered the tests of vicissitudes in the international arena, saying that China's friendly policy towards Africa has never changed and will never change.

Yang Liwei carried out the first step -- to send an astronaut into space and return safely -- in the Shenzhou-5 mission in 2003.

By the end of 2018, China had about 250 million citizens aged 60 and above, accounting for 17.9 percent of the total population. Nearly 180 million elderly people in the country have chronic diseases.

The Three Gorges project is a multifunctional water control system, consisting of a 2,309-meter-long and 185-meter-high dam, a five-tier ship lock, and 34 hydropower turbo-generators.