单语范例（未经PONS编辑处理）
英语
- The economy was focused mainly on the primary sector (agriculture and sheep husbandry) and on mining.en.wikipedia.org
- Extractive industries are, along with agriculture, the basis of the primary sector of the economy.en.wikipedia.org
- The share of the primary sector in the gross national product declined from 28% in 1947 to 11% in 1992.en.wikipedia.org
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英语