求翻译：外向型经济称为苏州经济的主要支柱，目前世界500强企业中已有77家来苏州投资办厂，5个国家级和10个省级开发区建设保持良好的发展势头是什么意思？

Export-oriented economy as the main pillars of the Suzhou economy, the world's top 500 enterprises have been 77 Suzhou investment in enterprises in five national and 10 provincial-level development zone construction to maintain the good momentum of development

An export-oriented economy known as the mainstay of the economy Suzhou, the current world 500 strong enterprises has been in a 77 run the factory to Suzhou, 5 state-level and 10 provincial-level development zones maintained a good momentum of development

The export-oriented economy is called the Suzhou economy the main prop, at present in the world 500 strong enterprises had 77 to come Suzhou to invest manages the factory, 5 state-levels and 10 provincial level development zone constructions preserves the good development momentum

Export-oriented economy as the main pillar of the economy in Suzhou, at present in the world's top 500 enterprises 77 investment and set up factories in Suzhou, 10 provincial and 5 national development zones to maintain good momentum in the development of

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