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He said that China is ready to work with Serbia to consolidate the all-weather friendship between the two countries, promote the quality of their bilateral relations and accelerate the growth of their ties.

Dubbed as a "super microscope," a spallation neutron source can produce and accelerate protons before smashing them into the target to produce neutrons, and the neutron beams will be directed to hit material samples. Researchers can thus accurately infer the atomic structure of the materials by measuring the distribution of scattered neutrons and their changes in energy and momentum.

Hua said the recent demonstrations in Hong Kong have turned into radical, violent and illegal behaviors, with a small number of radicals committing misdeeds, including setting fire and hiding a lot of offensive weapons.

"We will continue to work with people from all countries to push for jointly building a community with a shared future for humanity," Xi said in his speech.

The bay area, covering 56,000 square km, comprises Hong Kong and Macao, as well as nine cities in Guangdong. It had a combined population of about 70 million at the end of 2017, and is one of the most open and dynamic regions in China.