【大发彩神APP大发快3下载_大发彩神APP大发快3下载官网】Reinforcement project of ruins at Yuanmingyuan starts

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Staff members clean up weeds at ruins of Yuanying Guan (Immense Ocean Observatory) at Yuanmingyuan in Beijing, capital of China, May 23, 2018. The four-month reinforcement project of ruins of Immense Ocean Observatory at the historical site of Yuanmingyuan started lately.(Xinhua/Luo Xiaoguang)

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