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煤炭工业是美国的支柱。
The coal industry is the backbone of America.
"A writer's greatest tool is not the pen, but the ability to see the world through the eyes of others."
释义:他强调空气密度对于物质形态的决定性作用,认为物质的形态和性质都受到空气密度的影响。
The steel industry must adapt to the needs of the future.