Plant starches have been used in making bread, flour, and other food items for many years.

植物淀粉已被用于制作面包，面粉，及其他食品项目多年。

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Yeast can be used in making beer and bread.

酵母可用于酿啤酒和发面包。

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He made everything - except coffee - from sourdough, a substance used in making sourdough bread.

VOA: special.2009.01.24

The son writes that every miner's cabin had a "tin full of fermented dough, used in place of yeast in making bread, biscuits and flapjacks" hanging over the hot stove.

NPR: Sourdough: More than a Bread