Industrial cluster is not the phenomenon of many companies crowding together, it has an extremely complex and integrity systematic relationship.

产业集群并不是众多企业的扎堆现象，其内部具有极为复杂和完整的系统关系。

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Although this Safetygram addresses connections only for industrial compressed gas service and ultra-high-integrity gas service, much of this information also applies to the other two groups.

尽管本安全程序只说明用于工业压缩气体设施和超高纯度气体设施的接头，这些资料中的许多也适用于其它两组接头。

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There are many a research achievement regarding agglomeration, such as growth pole, regional production integrity, industrial agglomeration and new industrial district.

国外有关聚集的研究已经取得了许多成果，包括增长极理论、地域生产综合体理论、产业聚集理论、新产业区理论等。

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