为什么牛奶是白色的

时间：2009-03-11 06:01:50

（单词翻译:单击）

我们熟悉的“乳白色”来自于牛奶。那么牛奶为什么会是白色的呢？这主要是因为牛奶中的蛋白质——干酪素。

Those chalky-white mustaches that color our lips after chuggingdown a refreshing¹ ice-cold glass of creamy milk is caused by the protein called Casein.
Rich in calcium², Casein helps contribute to milk's white color.

In addition, the cream that is found in milk contains white colored fat. The more cream in milk the more white it is.

Low and non-fat milk appear more grayish rather than white because they contain less cream.

Another reason milk looks white to our naked eyes is because some objects do not absorb very much light. Rather than absorb light, these objects reflect light. For instance, red colored objects reflect only red light and absorb the other colors of light in the rainbow spectrum³. The molecules⁴ that make up Casein and cream reflect light. That's why milk is white.

mustaches: 胡子

Casein:干酪素

calcium:钙

non-fat milk:脱脂牛奶

spectrum:光谱

molecules:分子

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收听单词发音

1 refreshing
adj.使精神振作的，使人清爽的，使人喜欢的
参考例句：
I find it'so refreshing to work with young people in this department.我发现和这一部门的青年一起工作令人精神振奋。 The water was cold and wonderfully refreshing.水很涼，特别解乏提神。

2 calcium
n.钙(化学符号Ca)
参考例句：
We need calcium to make bones.我们需要钙来壮骨。 Calcium is found most abundantly in milk.奶含钙最丰富。

3 spectrum
n.谱，光谱，频谱；范围，幅度，系列
参考例句：
This is a kind of atomic spectrum.这是一种原子光谱。 We have known much of the constitution of the solar spectrum.关于太阳光谱的构成，我们已了解不少。

4 molecules
分子( molecule的名词复数 )
参考例句：
The structure of molecules can be seen under an electron microscope. 分子的结构可在电子显微镜下观察到。 Inside the reactor the large molecules are cracked into smaller molecules. 在反应堆里，大分子裂变为小分子。