Now many countries are developing the production technique of magnesia-carbon brick.

各国都在大力开发镁碳砖生产技术。

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Many advanced countries have a total ban on use of red brick.

现在许多先进地区已经全面禁止红砖使用。

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Many advanced countries have a total ban on use of red brick.

现在许多先进地区已经全面禁止红砖使用。

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