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"Given that the trade scale between China and the U.S. is huge, it is normal that trade frictions will occur," said Wang Hejun, head of the MOC's trade remedy and investigation bureau. "However, it is noticeable that the U.S. is imposing high taxes on Chinese imports and many of its measures are against WTO rules."

The area should prioritize ecological protection, improve people's well-being as well as protect and carry forward Chinese traditional culture, he said.

Beijing has a four-tier alert system for pollution, with red the highest, followed by orange, yellow and blue. The orange alert means the air quality index is forecast to exceed 200 for three consecutive days. During high alerts, heavy polluting vehicles and trucks carrying construction waste are banned from roads and some manufacturing firms cut production.

The global economy has remained sluggish for quite some time. Income inequality and uneven development all weigh heavily on global social stability.

Liu advised the country to invest more to restore important sea areas, coastal zones and islands.