China has completed the main span of a record-breaking sea bridge at Ningbo-Zhoushan port, with the new link expected to improve the efficiency of logistics at the world’s busiest cargo port.The main structure of the 2,212-metre (7,257-foot) Qinglongmen Grand Bridge in eastern China’s Zhejiang province has been completed, Science and Technology Daily reported on Tuesday, adding that it would link a cluster of islands within the Ningbo-Zhoushan port complex.The bridge is the world’s longest...