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"Every project is challenging as most of the students have never set foot in these areas," says Cao Yongkang, director of the International Research Center for Architectural Heritage Conservation at the university.

"Diversified regional cooperation has not only led to economic prosperity and sustainable development, but also has significantly contributed to regional solidarity and stability," said Zhang Wei, vice-president of Beijing-based Chinese Academy of International Trade and Economic Cooperation.

"Different cities will have different standards based on their conditions. Those who fail to meet their air quality improvement targets will be held accountable," Liu added. "In the coming months, we will make every effort to implement all tasks, vigorously reduce the emissions of major air pollutants and ensure the completion of the goal to improve air quality in autumn and winter."

"Every day is like a battle. Mistakes cannot be avoided. What we did right yesterday may not be applied today," he joked.

"E-commerce platforms hope to unleash the consumption potential from fourth-tier cities and below, as the growth of online shopping in first and second-tier cities is slowing down," said Cao Lei, director of the China E-Commerce Research Center.