Photo taken on April 25, 2019 shows part of an exhibition hall themed "journey of discovery" in the national maritime museum in Binhai New Area, north China's Tianjin. China's first national maritime museum has scheduled trial operation for May 1, local authorities said Thursday. Four exhibition halls, which focus on the themes of "the ancient ocean," "ocean today," "journey of discovery" and "the age of the dragon" respectively, will open during the trial. The three-story museum, which covers 150,000 square meters, has six display areas and 15 exhibition halls. (Xinhua/Li Ran)