The Hong Kong-Zhuhai-Macau Bridge is seen in Hong Kong, Monday, Oct. 22, 2018. The bridge, the world's longest cross-sea project, which has a total length of 55 kilometers (34 miles), will have opening ceremony in Zhuhai on Oct. 23. (AP Photo/Kin Cheung)
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China has opened the world's longest sea-crossing bridge linking Hong Kong to the mainland. The $20 billion bridge took almost a decade to build.