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According to Guo, the team had arrived in Freetown in June. Consisting of 14 members, they are tasked with helping Sierra Leone's armed forces building a modern center for prevention of infectious diseases in the post-Ebola era.

Together, the five countries now represent 44 percent of the world's population and 23 percent of global GDP, up from 12 percent a decade ago.

But she said all the other 19 members of G20 agreed that the Paris climate accord was irreversible and remained committed to it.

Xi encouraged Tajikistan to establish links with Chinese financial institutions, the Silk Road Fund and the Asian Infrastructure Investment Bank, saying China is willing to work with Tajikistan to facilitate trade and investment.

The government said PM2.5 levels have been lowered as the city progresses in its 2017 "clean air" targets of replacing coal with clean energy in 4,000 furnaces, removing 300,000 polluting vehicles from roads, and relocating 500 rudimentary manufacturers.