【英语时差8,16】白兰地是如何做出来的（上）

 Making wine is a biological process. Live yeast¹ added to grape juice digests the juice’s sugar giving off alcohol as a byproduct. How much alcohol is produced depends on how much sugar the juice starts with. But eighteen percent alcohol is about as strong as any wine can get before the yeast poisons itself and the fermentation stops. Brandy begins as wine but is then distilled², raising the alcohol concentration to forty or fifty percent–well above the level that would kill any yeast. To see how distillation³ works, picture steam from a kettle hitting a cold windowpane, where it condenses and drips off. The water dripping off is called “distilled water,” which is different from tap water because it no longer contains the salts and minerals with much higher boiling points, which were left behind when the water in the kettle turned to steam.

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 distilled   

adj.由蒸馏得来的v.蒸馏( distil的过去式和过去分词 )；从…提取精华

参考例句：

• The televised interview was distilled from 16 hours of film. 那次电视采访是从16个小时的影片中选出的精华。 来自《简明英汉词典》
• Gasoline is distilled from crude oil. 汽油是从原油中提炼出来的。 来自《简明英汉词典》

3 distillation   

n.蒸馏，蒸馏法

参考例句：

• The discovery of distillation is usually accredited to the Arabs of the 11th century.通常认为，蒸馏法是阿拉伯人在11世纪发明的。
• The oil is distilled from the berries of this small tree.油是从这种小树的浆果中提炼出来的。