长期以来，传统工业企业是国家经济命脉的支柱。
For a long time the traditional industrial enterprises have been the pillar of the national economics lifeline.
石油石化行业作为国家的战略产业，关系着国家的经济命脉，长期以来受到国家政策的保护。
As the national strategic industry, the petroleum and petrochemical industry is closely connected with the economic lifeline of a country and is protected by the country's policy.
铁路企业作为关系国家基础设施和国民经济命脉的重要企业，在经济社会中发挥着重要的基础性作用。
Railway business, as the important enterprises which concerns national infrastructure and national economy, plays an important role in the foundation of economic society.
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