第二十三课

23  The dough has grown面团长大了

1. Questions and guesses问题与猜测

2. Steamed buns are a traditional food in China, how are they made?馒头是我国的传统食品，是怎么做出来的呢？

3. Mom said you need to make dough when making steamed buns.妈妈说做馒头时需要发面。

4. Exploration and Practice探究与实践

5.  Let's make steamed buns too.我们也来做馒头。

6.  Add yeast.加入酵母。

7. Every now and then, observe the size of the dough and its internal changes.每隔一段时间，观察面团大小及其内部变化。

8. Information card资料卡

9. Yeast ferments some of the sugar in the dough into alcohol and carbon dioxide.酵母能将面团中的一部分糖发酵成酒精和二氧化碳，

10. It makes the dough form a puffy, fluffy, honeycomb structure.使面团形成膨大、松软、蜂窝状的结构。

11. When the dough grows, we can knead the buns.面团长大了，我们可以揉馒头了。

12. We start steaming the steamed buns.我们开始蒸馒头。

13. Steamed bun is a kind of fermented food.馒头是一种发酵食品。

14. Expansion and Innovation拓展与创新

15. Learn more about fermented products.了解更多的发酵产品。

16.  Bread, tofu milk, yogurt, vinegar, black tea面包、豆腐乳、酸奶、食醋、红茶