VOA慢速英语2012.01.18 饮用水, supplies, example, protect

Rebecca949

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The use of fluoride to protect teeth is common in many parts of the world. For example, it is often added to drinking water supplies. The fluoride mixes with enamel, the hard surface on teeth, to help prevent holes, or cavities, from forming.
在全球很多地区都通常使用氟化物保护牙齿。例如，它常常被添加到饮用水中。氟化物和牙釉质混合的坚固表面可以防止蛀牙的形成。
But young children often swallow toothpaste when they brush. The American Academy of Pediatric Dentistry notes that swallowing fluoridated toothpaste can cause problems. So young children should be carefully supervised when they brush their teeth. And only a small amount of fluoridated toothpaste, the size of a pea, should be used.
幼童刷牙时常会吞下去牙膏，美国儿童牙科学会称，吞咽含氟牙膏会有问题，所以幼童刷牙时要有大人严密监督，幼童只能使用很少量的含氟牙膏，豌豆粒那么大小即可。

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xulei2008

something  be missed...general  can understand the whole

迪子

When I'm a little girl about eight years old ,I usually  swallow toothpaste,becase I think it's very delicious, I wondered what effect  swallowing  toothpaste might have on my body when I grew up,but as a result I'm very healthy till now.

keshimian

谢谢楼主分享，天天练习,天天进步~~~

我是君君

o

tinaodile

When baby teeth begin to appear,you can clearly what to brush ,dentist say it is  important to find soft tooth brush,maybe  for baby,and use them very gently.

丫头11

高二了，才来练听力会不会太晚啊？听不懂怎么办？？？？？？？？

wenyinhua

顶一个啊！

yvonnebec

必须顶

风华无双

回复后有什么？？？

JamesF4

一点都听不懂，继续努力中

gqinchunh123

天天学习，争取每天都进步