托福听力课外资料练习：科学美国人60秒氟化物保护牙齿相关内容分享

在托福听力考试的备考过程中，科学美国人60秒相信大家一定用得比较多，那么大家平时是如何利用这个课外资料的呢?这里小编整理了科学美国人60秒：氟化物保护牙齿的内容分享，大家一起来学习一下吧。

科学美国人60秒听力练习：氟化物保护牙齿

科学美国人60秒英文文本

人们通常认为，牙齿的氟化层有护牙的作用，研究发现，这种保护是有限的。

Spectroscopic analysis finds that the fluoridated layer thought to protect teeth is probably too thin to be responsible for fluoride's effects. Karen Hopkin reports

Beauty is only skin deep. And the beauty of shiny white teeth is even less deep. Because a new study shows that fluoride forms a thinner protective shield than experts thought it did. The results appear in the surface science journal Langmuir. [Frank Müller et al., "Elemental Depth Profiling of Fluoridated Hydroxyapatite: Saving Your Dentition by the Skin of Your Teeth?"]

American consumers spend more than $50 billion a year fighting cavities. When we realized that fluoride could help, we put it in our drinking water, our toothpaste and our mouthwash. But how does fluoride work its magic? Many figured that fluoride chemically reacts with the main mineral in enamel to form a thick, decay-resistant veneer. But the latest research kicks that idea in the teeth.

Scientists in Germany used x-ray photoelectron spectroscopy to get a detailed image of the surface of a treated tooth. And they found that the protective covering is actually only 6 nanometers thick. That’s about a fifteen-thousandth as thick as a sheet of paper. And a layer that skimpy would likely be worn away by ordinary chewing.

How fluoride keeps the tooth fairy away is a mystery that researchers are still working to unravel. In the meantime, we may not know how it works, but we know that it works. So keep brushing.

科学美国人60秒词汇翻译：

1. spectroscopic adj. 分光镜的, 藉分光镜的

2. fluoridate vt. 向 ... 中加入氟化物

3. fluoride n. (护齿的)氟化物

4. enamel n.珐琅，搪瓷，瓷釉;(牙齿的)珐琅质

5. veneer n.(镶于劣质东西上的)镶面板，外表

6. photoelectron n. 光电子

7. spectroscopy n. [物]光谱学

8. nanometer n. 纳米

9. skimpy a.不足的;太紧的

10. unravel v.解开, 阐明, 解释, 破坏(计划、安排等)

以上就是小编为大家整理的科学美国人60秒：氟化物保护牙齿的文本以及翻译，大家练习的时候还可以找来音频资料一起练习，效果定会更好。最后，小编预祝大家托福考试能取得理想的成绩。

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