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BEIJING, March 21 (Xinhua) -- Public health crises pose a common challenge for humanity, and solidarity and cooperation are the most powerful weapon to tackle them, Chinese President Xi Jinping said in a recent message of sympathy to German Chancellor Angela Merkel.

China has coordinated the prevention and control work with the economic and social development, and tried its best to minimize the impact of the epidemic, he said.

Amid efforts to ensure safety services at epidemic-related sites and producers of anti-epidemic materials, measures will be taken to strengthen safety governance of key industries, with emphasis on hazardous chemicals, coal mines, non-coal mines, road traffic, construction, urban operation and other related fields, said the circular.

The circular required tourist sites to encourage visitors to reserve visiting slots in advance to control visitor flows and prevent large gatherings of people.

Chinese provinces and cities have also taken the initiative to provide assistance to African countries and renowned Chinese medical experts have held 14 video conferences with their African counterparts and the 46 Chinese medical teams in Africa have conducted nearly 400 training sessions for local medical workers, according to the Chinese minister.