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The two sides also exchanged views on regional issues such as the Korean Peninsula situation.

The twins - Pei Yuanjin and Pei Yuantong, according to reports - had come to the coastal city with their mother, surnamed Sun, for a holiday.

The two sides conducted negotiations on the text of the agreement as well as remaining issues on their list, making positive progress, the ministry said in a statement published on its website.

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The transition from supply-side structural reform to a linkage of supply side and demand side in the new development pattern aims to adapt to new features at the current stage of China's development, while the country is facing major changes in the global political and economic environment. The new development pattern is not only a progressive deepening of supply-side structural reform but also an integration and enhancement of China's development strategies in the past.

The two sides have also discussed a range of issues regarding cooperation in the fields of agricultural products and processing, information technologies, construction, tourism and other areas.

The tram now operates on a 136-year-old railway in Tangshan and will be promoted to more cities at home and abroad.

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The two countries will continue to discuss connecting the Belt and Road with Brazil's development plans, Xi said, adding that they should enhance cooperation in areas such as agriculture, energy, mining, electricity, infrastructure, science, innovation and the digital economy.

The transport capacity of the airports registered robust growth, with the annual passenger throughput more than tripled to 1.26 billion trips and cargo volume nearly doubled to 16.74 million tonnes. Air traffic movement reached 11.09 million, compared with 4.23 million 10 years ago.

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The ultraviolet lamps are also equipped in some US hospitals, hotels and manufacturing bases, according to AP.

The two governments agreed last year to jointly announce the new height. In his letter, Xi noted that the teams of the two countries have overcome various difficulties, carried out important work and finally determined the new height.