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For Hong Kong, the focus is not whether the principle will change or not, but how to implement it comprehensively and accurately, Xi stressed.

Sun Kewen, the Chinese director for the KNU Confucius Institute, said the Chinese proficiency of the contestants and the popularity of the "Chinese Bridge" in Ukraine are rising with each coming year.

China is willing to work with Russia and other member countries to promote the SCO solidarity and make cooperations among SCO members more efficient and more effective, Wang said.

With regard to Pakistan-China relations, Hussain said the two countries are iron brothers and on issues concerning China's core interests, Pakistan will unswervingly support China's position.

Trial mining of combustible ice in the Shenhu sea, about 320 kilometers southeast of Zhuhai City in Guangdong, started on March 28. Experts first tapped the natural gas hydrate at a depth of 1,266 meters underwater last Wednesday.