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BEIJING, Nov. 17 (Xinhua) -- Beijing and surrounding areas reported good air quality on more days in October thanks to strengthened efforts to reduce emissions.
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During their talks, visiting Chinese President Xi Jinping, also general secretary of the Communist Party of China (CPC) Central Committee, and Nguyen Phu Trong, general secretary of the Communist Party of Vietnam (CPV) Central Committee, spoke positively of the two countries' development achievements and agreed to carry forward, preserve and promote the traditional friendship between China and Vietnam.
The fifth detected source as it was, the source of gravitational waves was historical since a glowing aftermath of the collision of two neutron stars was visible by traditional telescopes.
"The crash of binary neutron stars is like a gigantic gold factory in the universe," said Jin Zhiping, an associate researcher with the observatory and a member of an international team that analyzed optical signals.
来源：资阳报