Actually, potatoes have become a main part to global food system, they are the third major cereal crop only after wheat and rice (Corns are planted widely but majorly used as animal feed).

• 实际上，土豆已经是全球粮食系统的一个主要组成部分，它是仅次于小麦和大米的世界第三重要的粮食作物（玉米虽然种植甚广，但主要用作动物饲料）。