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"China is a resource-rich country, but the ore grade is relatively low and some resources are not easily accessible."

"By implementing projects such as sintering flue gas, desulfurization and using gas instead of coal, air pollution has been greatly reduced," Li said.

"But now the two sections of the bridge are connected, and as a builder of this super bridge, I feel very proud. Also, I've earned a handsome income from it," he said.

"China has mastered the core technologies of commercial maglev trains, and has established a comprehensive system ranging from technical research and manufacturing to commercial operations," said Liu Youmei, an academician of the Chinese Academy of Engineering.

"But now our challenge is to make correct decisions for future competition, but you never know what your decisions made today may mean three or five years later," he said.