Food sources of B: Yeast powder, egg yolk, meat, milk, soy, whole grains.
食物b的来源：酵母粉，蛋黄，肉，牛奶，黄豆，全谷类。
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Mix together the flour, yeast, baking powder and sugar in a bowl.
混合均匀面粉，酵母，烤粉和砂糖在一盆里。
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