英文书摘精选 The Mysterious Liquid In Yogurt酸奶中的神秘液体
时间：2018-12-28 作者：英语课 分类：初学者听力文摘精选
The Mysterious Liquid In Yogurt酸奶中的神秘液体（双语）
When you open a container of yogurt, you’ll often see liquid collected on top. Some people mix it back into the yogurt, and others drain it off. What is it, and where does it come from?
打开一盒酸奶，你常常会发现有一层液体浮在表面。有的人把它拌入酸奶中，有的人则将这层液体倒掉。这层液体究竟是什么东西，它又是从哪来的呢？
To solve the mystery of the liquid in yogurt, let’s take a few steps back, to the milk that yogurt is made of. Milk has two different types of proteins. Most of the proteins are casein proteins, and the rest are whey proteins–of curds 1 and whey fame.
为了揭开酸奶中这层液体的神秘面纱，让我们往回追溯，去看看制作酸奶的原料—牛奶。牛奶有两种不同类型的蛋白质。大部分蛋白质是酪蛋白，其余是乳清蛋白，包括凝质和乳清。
If you look at a glass of milk, you can’t tell the casein from the whey. But that changes when special bacteria are added to milk to make yogurt. Yogurt-producing bacteria ferment 2 the sugars in milk and produce an acid. As a result, the mixture is more acidic than before, and this higher acidity 3 solidifies 4 the casein proteins. The whey proteins, on the other hand, don’t solidify 5, and separate out from the casein as liquid.
单单看一杯牛奶，我们是无法从中分辨出酪蛋白和乳清的。但是往牛奶中加入特殊的细菌来制作酸奶时，情况就不一样了。制作酸奶用的细菌会发酵牛奶中的糖并制 成酸。因此，混合物比之前更酸，更高的酸度使得酪蛋白凝固。而另一方面，乳清蛋白则不会凝固，它会从酪蛋白中以液体的形式分离出来。
Yogurt you buy in the store has a stabilizer, usually fruit pectin, to keep the solid casein and liquid whey mixed together. But some of the whey still separates out from the casein, and that’s what you see when you open the yogurt container.
你在超市买到的酸奶中含有一种稳定剂，通常是果胶，它的作用是让固体的酪蛋白和液体的乳清混合在一起。但是部分乳清仍然从酪蛋白中分离出来，那就是你在打开酸奶包装时所看到的液体。
Whey contains not only proteins but also B vitamins, including riboflavin, niacin, and thiamin, which can’t be found in the solid portion of the yogurt. Because of the nutritional 6 value of whey, your best bet is to mix it back into the rest of the yogurt, then gobble it down!
乳清不仅含有蛋白质还有维生素B，维生素B包括核黄素，烟酸和硫胺素，这些物质反倒无法在酸奶的固体部分中获得。因为乳清的营养价值，你最佳的选择是把它和酸奶搅拌在一起，然后一饮而尽！
- Little miss muffet sat on a tuffet eating some curds and whey. 小玛菲特小姐坐在垫子上，吃着凝乳和乳清。 来自互联网
- The curds contain casein, fat and minerals. 凝乳中有酪蛋白、脂肪、矿物质。 来自互联网
- Fruit juices ferment if they are kept a long time.果汁若是放置很久，就会发酵。
- The sixties were a time of theological ferment.六十年代是神学上骚动的时代。
- This plant prefers alkaline soil,though it will readily tolerate some acidity.这种植物在酸性土壤中也能生存，但硷性土壤更加适宜。
- Gastric acidity would not prevent the organism from passing into the gut.胃的酸度不能防止细菌进入肠道。
- Jelly solidifies as it gets cold. 肉冻冷却就凝固。
- It is stirred with 10%sodium carbonate solution(50ml)and then with water (50ml), after which It'solidifies. 与10％碳酸钠溶液（50毫升）混合搅拌，然后再用50毫升水混合搅拌，从而析出固体。
- Opinion on this question began to solidify.对这个问题的意见开始具体化了。
- Water will solidify into ice if you freeze it.水冷冻会结冰。
- A diet lacking in nutritional value will not keep a person healthy.缺乏营养价值的饮食不能维持人的健康。
- The labels on food products give a lot of information about their nutritional content.食品上的标签提供很多关于营养成分的信息。