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China will work with Southeast Asian nations to make the South China Sea a sea of peace, friendship and cooperation, he said.

Acknowledging the less-than ideal global economic environment, Xi said the country's bottom-line responsibility is to ensure the people's livelihood, and reform should start with the issues the public feel most strongly about.

"China and Arab countries now enjoy content-rich bilateral cooperation in politics, economy and people-to-people exchanges," Gong said, adding that the two sides are cooperating in such areas as railways, harbors, energy and telecommunication.

British Prime Minister David Cameron chaired the summit at Lancaster House in London on Thursday. Presidents from Afghanistan, Colombia, Nigeria and other countries, senior ministers from G20 countries, as well as leaders from international organizations are attending the summit.

The meeting approved a document regulating business operations by family members of officials, a practice which has been extended to Beijing, Guangdong, Chongqing and Xinjiang on the basis of a trial in Shanghai.