【英语时差8,16】葡萄酒和啤酒：不同酒种，同样基本过程-上

You start with a liquid containing some kind of sugar, add yeast¹, and wait. The yeast digests the sugar, giving off alcohol in the process. The sugar in beer comes mostly from a grain called barley². With wine, the sugar usually comes from grapes. Either way, when the yeast finishes its work, the sugar has been turned into alcohol–which stays–and carbon dioxide, which bubbles to the surface. Since wine starts out with more sugar than beer does, it ends up with more alcohol. If you make beer or wine at home, the trick is knowing just how much sugar to start out with in order to get the alcohol content you want to end up with. However, if the alcohol gets too strong, it’ll poison the yeast, stopping the fermentation altogether.

1 yeast   

n.酵母；酵母片；泡沫；v.发酵；起泡沫

参考例句：

• Yeast can be used in making beer and bread.酵母可用于酿啤酒和发面包。
• The yeast began to work.酵母开始发酵。

2 barley   

n.大麦，大麦粒

参考例句：

• They looked out across the fields of waving barley.他们朝田里望去,只见大麦随风摇摆。
• He cropped several acres with barley.他种了几英亩大麦。