当经济增长时，在技术、生产要素供应量和需求方面会有重大的变动。
As economies grow, there are major changes in technology, factor supplies, and demand.
通过本文的研究可以得出这样的结论：产业演化实质是要素组合的变动，技术要素在要素组合中起着主导性作用，技术进步通过供给、需求两方面主导产业演化。
The paper reaches a conclusion that industrial evolution is in nature a change of the combination of production factors, where technical factor plays a leading role in both supply and demand aspects.
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