首先，本文回顾了产业集群外部经济效应理论，为后续的比较研究和分析提供理论基础。
First of all, this paper reviews the industrial cluster external economy effect theory; offer the theoretical foundation for subsequent comparative study and analysis.
产业集群是一把“双刃剑”，对技术创新既具有外部经济效应，又具有外部不经济效应。
The industry merger is "a two-edged sword" which has both outside economical effect and outside non-economical effect on the technology innovation.
高技术产业规模经济特征明显、附加值高、外部经济效应强烈，在推动产业结构升级中起了主导作用；
The high-tech industry with significant characteristics of scale economics, high added value, and intense extrinsic economic effect plays a leading role on the promotion of industrial upgrading.
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