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During his keynote speech at the opening ceremony of the Forum on China-Africa Cooperation (FOCAC) in Johannesburg, Mugabe thanked China for its unconditional support to African causes.

As China's economy developed, environmental protection became a concern. Tianjin Eco-City, the second government-to-government project between China and Singapore, was established to learn from the garden city's magic to advance the economy in an environmental-friendly way.

The three nations also pledged to promote sustainable development. They have agreed to deepen cooperation on tackling emerging infectious diseases, air pollution and climate change.

The implementation of the 13th five-year plan will ensure China's economy will develop at a higher level, and will provide more opportunities for China-U.S. cooperation, he said.

Still, some thorny issues split the two sides, but Xi and Obama expressed their willingness to manage the differences between their countries.