primary sector短语¹⁴⁴⁹⁷²⁺² 基本例句 初级成分 Haneen explains how the primary sector is strategic in sustaining families living in rural areas with no access to the main markets: these families are permanently at risk to become Food Insecure. Haneen如是解释着扶持农业区无法到达主要市场的家庭的战略措施：这些家庭将永远成为粮食生产的不稳定因素。 douban