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NANJING, Nov. 1 (Xinhua) -- China needs to enhance rule of law on the Internet to create a clean cyber space, experts said at a seminar Saturday.

Li expected a fruitful annual meeting of China-Singapore bilateral cooperation mechanism to be held later this month, saying he welcomes Singapore to participate in the development of China's western regions.

Noting that the common interests between China and the United States far outweigh their differences, Wang stressed that there are more and more fields in which the two countries could and should cooperate with each other.

Vucic, for his part, reaffirmed that Serbia is willing to further develop its strategic partnership with China on the basis of mutual respect and equality, and well implement various cooperative agreements with China.

"Sometimes, the air near the ground is cold while above it is hot, like a lid on a big pan. The lower air cannot diffuse," he said. This was the cause for serious smog in Beijing in January 2013.