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Transit air, train, and ship passengers entering either of the six border ports in Beijing, Tianjin and Hebei can stay in the region for six days before heading for another destination, according to Beijing's Port Office. A valid travel document and a connecting ticket are required.

Zhong Zhong and Hua Hua are the product of somatic cell nuclear transfer (SCNT), the technique used to create Dolly the sheep over 20 years ago.

Li stressed the importance of winning the "three tough battles", namely risk prevention, poverty alleviation and pollution control.

China aims to raise the use of natural gas to 10 percent of the country's energy mix by 2020 and 15 percent by 2030, according to the National Development and Reform Commission.

"Therefore, healthy eating depends on the food itself, and it should not be designated according to different dietary habits in western and eastern countries. The basic rule to avoid misdirection is that healthy eating should not go against the basic human needs," Wang said.