农业社会的存在离不开主粮作物。

Agricultural societies cannot exist without staple crops.

玉米是东南亚的一种主粮作物，既作为食物，又作为动物家畜养料。

Maize is a staple crop in South-EastAsia, both as a food and animal feed.

尼日利亚已经成为世界上最大的粮食进口国之一，特别是大米和小麦，该国本可以大面积种植这两类主粮，以实现自给自足。

Nigeria has become one of the world's biggest importers of food staples, particularly rice and wheat, both of which the country could potentially grow in large enough quantities to be self-sufficient.