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Identifying the origin of emerging viral disease has proven complex in past epidemics in different countries. A well planned series of scientific researches will advance the understanding of animal reservoirs and the route of transmission to humans. The process is an evolving endeavor which may lead to further international scientific research and collaboration globally, Zhao said.

Noting that tea originated in China and became popular in the world, Xi said China, a major producer and consumer of tea, is willing to work with all sides to nurture the sustained and healthy development of the global tea industry, deepen cultural exchanges on tea, and allow more people to relish lives accompanied by tea.

The 12-member team from central China's Hunan Province also brought a consignment of medical supplies including ventilators, nucleic acid testing kits, face masks and medical protective suits.

He expressed China's staunch support to the WHO, calling on the international community to increase political and financial support for WHO so as to mobilize resources worldwide to defeat the virus.

The projects involve flood control, allocation of water resources, irrigation and water supply, water ecological protection and smart water conservancy, Su said.