Children pose for photos with an exhibit showing the Tianzhou-1 cargo spacecraft docking with Tiangong-2 space lab at a high-tech exhibition at Victoria Park in Hong Kong, south China, on June 28, 2017. The exhibition named "Innovation in Science and Technology, Realization of Our Dreams" kicked off here on Wednesday with more than 100 exhibits showcasing China's achievements on aerospace science and technology. The exhibition was held to celebrate the 20th anniversary of Hong Kong's return to the motherland. (Xinhua/Lui Siu Wai)
