For a long time, the petroleum industrial organization has been lower in efficiency, the result of lacking in market structure of oligopoly.
长期以来，石油产业组织效率低下，一个很重要的原因是没有形成寡占型市场结构。
However, this kind of characteristic of industrial cluster which makes the industrial cluster organization more efficiency also causes its risk simultaneously.
不过，这种提升效率的产业集群特性同时也是导致产业集群风险的根源。
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