The Egyptians, however, did not discover leavened bread until about 3000 B.C.

然而，埃及人直到公元前3000年才发现发酵面包。

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Leavened bread is bread that rises. It is usually baked in an oven.

发酵面包是膨松的面包，它通常在烤箱里烘烤而成。

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The best-known Chinese-style burger perhaps is Roujiamo — shredded braised meat stuffed in baked leavened bread.

最有名的中国风汉堡或许是肉夹馍——烘烤过的白吉馍里塞满了切碎的炖肉。

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Sourdough is the oldest form of leavened bread and was used at least as early as ancient Egypt.

NPR: Sourdough: More than a Bread