Combined photos taken in 2013 (upper) and 2016 show the Hangzhou Olympic Sports Center under and after construction in the Binjiang District of Hangzhou, capital of east China's Zhejiang Province. The landmarks in Hangzhou have experienced great changes during the past years. They'll stand as the symbols for Hangzhou to welcome the coming G20 Summit with fresh new looks. (Xinhua/Wu Guofang)
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