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During the past three decades, many rural people left hometown for employment in China's rapidly expanding cities, leaving elderly and children at the countryside.

Liu also called for improved integration of Party-building with the effort of advancing economic and social development.

"China-U.S. relations are generally stable," Zhang said, suggesting the two sides continue to implement the consensus reached between their heads of state to build a new model of major-country relationship.

Liu, who is president of the Party School of the CPC Central Committee, was speaking at the school's spring semester opening ceremony on Tuesday.

"I thought it was an earthquake. I heard a loud bang and felt vibrations," said Zhong Zhiyong, who was home with his 3-year-old grandson in their sixth-floor apartment when the accident happened. "When I opened the door I saw the stairs had disappeared."