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international:sector,
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primary:sector,
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physical:industry,
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technical:industry,
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technological:field,
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dangerous:enterprise,
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major:industry,
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global:industry,
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private:entity,
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rural:industry,
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interested:party,
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basic:industry,
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competitive:sector,
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industrial:sector,
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established:industry,
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private:sector,
Category Nuances for petroleum_industry:
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competitive,
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primary,
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technical,
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physical,
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established,
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technological,
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private,
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international,
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interested,
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dangerous,
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industrial,
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basic,
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rural,
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major,
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global,
Simple Categories for petroleum_industry: