China's first domestically developed "ternary mixed gas" shield tunneling pressurized operation system has officially been put into use in the 16.18-kilometer Jintang undersea tunnel, the world's longest undersea high-speed rail tunnel, across the waterway between Ningbo and

China's first domestically developed "ternary mixed gas" shield tunneling pressurized operation system has officially been put into use in the 16.18-kilometer Jintang undersea tunnel, the world's longest undersea high-speed rail tunnel, across the waterway between Ningbo and

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