求翻译：它源于弗农的工业生产的产品生命周期理论，后经威尔斯和赫希哲等的验证、充实和发展，被引入区域经济学中，便产生了区域经济发展的梯度转移理论。是什么意思？

It originated from Vernon's industrial production of the product life cycle theory, by the Prince and He Xizhe after such verification, enrichment and development, has been introduced in regional economics, regional economic development have resulted in the gradient transfer theory.

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Its source in Vernon's industrial production product life cycle theory, latter after Wells and Hirsch wise and so on confirmation, enrichment and development, is introduced in the regional economics, then has had the region economy development gradient shift theory.

It comes from Vernon's product life cycle theory of industrial production, after validation, enrichment and development of Wales and hexizhe, was introduced in regional economics, produced the gradient transfer theory of regional economic development.

It originated from Vernon's industrial production of the product life cycle theory, by the Prince and He Xizhe after such verification, enrichment and development, has been introduced in regional economics, regional economic development have resulted in the gradient transfer theory.