食物主食英语单词是Staple food。Staple food的例句：Rice is the staple food of more than half the world's population（稻米是全世界一半以上人口的主食）。

Staple food的例句：Rice is the major crop and staple food（水稻是主要的作物和人们的主食）；Bamboo stalks and roots are the staple food of pandas（而竹子的茎和根是熊猫赖以生存的主食）。