钢铁工业是国民经济的支柱产业，高炉炼铁是钢铁工业的重要组成部分。
Steel industry is the pillar of the national economy and blast furnace is very important for the steel industry.
电站设备企业是为电力工业提供装备的行业，是国民经济的支柱产业。
Power equipment manufacturing industry is a pillar industry of national economy, which provides equipments for electric power industry.
所以，我们要振兴机械工业，使之成为国民经济的支柱产业。
So, we must promote machinery industry, has become a pillar industry of the national economy.
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