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The standard of living in many developing countries is still low.
许多发展中国家的生活水平仍然很低。
youdao
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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。
youdao
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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。
youdao