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. [Photo/Xinhua]
Staff members clean up weeds at ruins of Yuanying Guan (Immense Ocean Observatory) at Yuanmingyuan in Beijing, capital of China, May 23, 2018. [Photo/Xinhua]
Staff members clean up weeds at ruins of Yuanying Guan (Immense Ocean Observatory) at Yuanmingyuan in Beijing, capital of China, May 23, 2018. [Photo/Xinhua]
Staff members clean up weeds at ruins of Yuanying Guan (Immense Ocean Observatory) at Yuanmingyuan in Beijing, capital of China, May 23, 2018. [Photo/Xinhua]
Staff members clean up weeds at ruins of Yuanying Guan (Immense Ocean Observatory) at Yuanmingyuan in Beijing, capital of China, May 23, 2018. [Photo/Xinhua]
