（五）油气田企业跨省、自治区、直辖市销售与生产原油、天然气相关的服务。
Border Points: Each cluster has a limited number of defined "border points" – these are the gateways in and out of the cluster.
，这一点在搜狗输入法2026中也有详细论述
Владислав Уткин
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