bread是物质名词，表示单纯物质概念时，没有复数形式，如要表示数量，须在其前使用具有单复形式的计量单位，加上of结构；a bread还可指一份面包或一种面包， breads则指多份面包或多种面包。

Could you stop by the store on the way home for some bread?

回家时你能不能顺路进那家店里买点面包？

Make sure you cut the bread nice and thick.

你一定要把面包片切得厚厚的。

There was usually some bread going cheap at the end of the day.

在收市前常常有些面包降价出售。