Visitors take an interest in exhibits at the booth of China National Offshore Oil Corp., the largest offshore oil and gas producer in China, at the 2023 China Marine Economy Expo, which opened at the Shenzhen Convention and Exhibition Center in Futian District on Thursday. The expo, along with the 2023 Shenzhen International Marine Week, will run until Saturday and Monday, respectively.     (Story on P3)  Liu Xudong