RIYADH, Jan. 20, 2016 -- Chinese President Xi Jinping (L) and Saudi King Salman bin Abdulaziz Al Saud inaugurate the operation of the Yasref oil refinery, a joint venture between Saudi Aramco and China's Sinopec in Riyadh, Saudi Arabia, Jan. 20, 2016. (Xinhua/Ma Zhancheng)
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