短语词组短语Food Security Crop 粮食安全作物food -crop 粮食作物Food crop science 粮食作物学staple e food crop 主要粮食作物Food crop insurance 粮食作物保险Subsistence food crop 自给作物Upland food crop production 旱粮生产food crop production 粮食产量 返回 food crop