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Cao Xiaojia, a doctor specializing in skin diseases at Chinese People's Liberation Army 306 Hospital in Beijing, said willow seeds are a common allergen in spring, with patients displaying symptoms such as red and itchy skin.

Cao Lei, director of the China E-Commerce Research Center, said e-commerce players are seeking new growth points and tapping the consumption potential from fourth-tier cities and below this year, as the growth of online shopping in first and second-tier cities is slowing down.

Central and western regions have their unique advantage in developing the service trade, Li said. Compared with coastal areas, they have lower cost in land and human resources. In addition, local governments have unveiled measures to attract investment and develop the service trade. With increasing facilitation of transportation and logistics, central and western regions' advantage in developing the service trade have become even more prominent.

Chappell said the study's findings underlined the importance of wind power in helping achieve the goals of the 2015 Paris Agreement on climate change, and fighting global warming.

Cargo will be transported via the Chinese-built Standard Gauge Railway, known as the SGR, from Mombasa to Nairobi, which launched cargo services on Jan 1, 2018.