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"Children in Costa Rica are now taught Chinese in school," he said. "Most people around the world would like to speak Chinese, because China has become one of the most important markets in the world, and we need to communicate with each other."

"But the world will not and cannot go back to the way things were," Tedros said."There must be a 'new normal'－a world that is healthier, safer and better prepared."

"China has quickly vowed to retaliate and if such an escalation does materialize, it would have significant economic impact on China, the US and the rest of the world, at a sensitive time for the global economy," it said.

"But with the social and economic development, water shortages, damage to aquatic ecosystems and water contamination have become the main issues," he added.

"China is against any act of kidnapping of civilians and opposes terrorism and extreme violence in any form," Hua added. Islamic State has killed two Chinese teachers it kidnapped in Pakistan's southwestern Baluchistan province last month, the militant group's Amaq news agency said on Thursday, Reuters reported at midnight on Friday.