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"Not having been listed yet, many old buildings with local characteristics and history have already vanished," said Cheng Jiyue, an architect.

"Over the past 40 years, China's economic development has been achieved thanks to opening up. In the future, China's high-quality economic development must be pursued with even greater opening up," he said.

The leaders are also expected to discuss a coordinated and balanced development of China-Africa cooperation. To further build the China-Africa comprehensive strategic and cooperative partnership, the two sides will seek greater headway in existing areas such as infrastructure, trade, financing, health and human resources development. They will also seek new growth points in fields ranging from poverty reduction, living standards improvement and people-to-people exchanges, to peace and security and environmental protection.

"When you write things down, you will be surprised how much unnecessary waste you have made and how you could have avoided it," she said. "If every one of us could order one less delivered meal, or use one less plastic bag, together we could make a big difference."

Li made the remarks when meeting with journalists together with German Chancellor Angela Merkel after they held talks in Beijing.