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China had 9.02 million left-behind children, according to a census by the ministries of civil affairs, education and public security from March 2016.

China has modified 487 physical tollgates on provincial borders into ones that can offer the ETC service and has 48,211 lanes for ETC service so far, according to the ministry.

China has adopted more than 10,000 international standards in its national standards. It is also one of the most active countries submitting proposals for international standards, Tian said.

China has also signed 14 deals on tackling climate change with 13 African nations since 2011, and has donated a large amount of equipment to help countries in the continent cope with climate change, including more than 10,000 sets of solar photovoltaic power generation equipment and launching a small satellite.

China began to construct its Beidou navigation system, named after the Chinese term for the Big Dipper constellation, in the 1990s and started to serve the Asia-Pacific region since 2012. It is currently one of the four largest space-based navigation networks operating globally, along with the US GPS system, Russia's GLONASS and the European Union's Galileo.