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Bei Bei, a four-year-old giant panda cub, chomps on bamboo at the Smithsonian's National Zoo in Washington on Tuesday,hours before he left for China aboard a FedEx plane. Photo by Zhao Huanxin / China Daily
Beijing, for example, aims to lower its PM2.5 density to 60 micrograms per cubic meter in 2017, a challenging target to reach according to meteorologists.
Beijing plans to cap its population at 23 million by 2020 to address problems such as traffic congestion and pollution.
Beijing expressed "serious concerns" on Wednesday over Pyongyang's recent comments regarding further nuclear and missile tests, saying it is resolutely opposed to any words or actions that could increase tensions.
Beijing, China's capital since the 13th Century, once had 20 city gates. They were built as key passageways for different social classes - including the imperial family, civil and military officials, members of the public and even criminals - to come and go from the city.
来源：资阳报