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Tan Guoshun, an expert in bridge construction who has participated in many big projects, told Xinhua that breakthroughs were made in construction management, technique, safety and environmental protection.

He called on Chinese youth to uphold the belief in the country's "two centenary goals" and the Chinese dream of national rejuvenation and take their responsibilities in the cause.

Xi invited Nguyen Phu Trong, general secretary of the Communist Party of Vietnam (CPV) Central Committee, to visit China in January this year. Xi and Trong had in-depth exchanges on major issues of common concern, and clarified the direction of future China-Vietnam ties.

The negotiation of an upgraded free trade agreement should be completed as soon as possible, she noted.

Xi's four-day tour, starting on Wednesday, includes a state visit to the Central Asian country at the invitation of Kazakh President Nursultan Nazarbayev, and the attendance of the annual meeting of the SCO's supreme decision-making body, the Council of Heads of State, as well as the opening ceremony of the 2017 World Expo in Astana.