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ROSARIO, Argentina, May 13 (Xinhua) -- Rosario, Argentina's port city and busiest agricultural exports hub, some 300 km north of Buenos Aires, is an important bond between Argentina and its second-largest trade partner and largest destination for exports -- China.

As an example of its active international engagement, China has worked closely with the United States to build the Center of Excellence on Nuclear Security (COE) of China in suburban Beijing. As the largest, best equipped and most advanced facility of its kind in the Asia-Pacific region, the COE will serve as a venue for a variety of international exchanges and cooperation programs.

China's ambassador to Ecuador, Wang Yulin, presented the aid to Ecuadorian Foreign Affairs Minister Guillaume Long at a ceremony at the ministry's headquarters in the capital Quito.

BEIJING, May 20 (Xinhua) -- Vice Premier Zhang Gaoli on Friday urged greater courage, stronger resolve and more powerful measures to deal with air and water pollution.

In company with his Czech counterpart Milos Zeman, Xi toured around the place and stepped onto the veranda to have a bird's eye view of the Prague city.