Rye, wheat, and barley are the basis for Russian breads.
黑麦，小麦，大麦是俄罗斯面包的基本原料。
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Flat, unleavened bread, the earliest form, is still eaten in the Middle East, Asia, and Africa. The principal grains used in such breads are wheat, barley, millet, buckwheat, rye, and corn.