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World's longest undersea high

Posting time:2024-04-30 11:47:12

The<strong></strong> massive tunnel boring machine named

The massive tunnel boring machine named "Yongzhou", designed for the groundbreaking Jintang undersea tunnel project, rolls off the production line, Feb. 26, 2024 in Changsha, central China's Hunan Province. (Photo/China News Service)

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