Aerial photo taken on Dec. 19, 2018 shows an architecture with solar photovoltaic system in the Sino-Singapore Tianjin eco-city in Binhai New Area, north China's Tianjin. The Sino-Singapore Tianjin eco-city, inaugurated in 2008, is an intergovernmental cooperation project designed to strengthen environmental protection, conserve resources and build a harmonious society. The eco-city is expected to be a model for other cities in China. (Xinhua/Yue Yuewei)