Bad teeth can be painful -- and worse. They can even be deadly. Infections of the gums and teeth can release bacteria into the blood system.
牙齿坏了会很痛，甚至更糟，可能会致命。被感染的牙龈和牙齿向血液系统释放细菌。
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For example, in two thousand and seven, doctors in the Washington area said a boy died when a tooth infection spread to his brain. They said it might have been prevented had he received the dental care he needed. He was twelve years old.
例如，2007年华盛顿地区的医生表示，一个男孩由于牙齿感染蔓延至大脑而死亡。他们说，如果他做了所需的牙齿护理这事就能够避免。他当时才12岁。
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作者: 朵美郁子 时间: 2012-1-16 15:19
播放不起作者: jiangxiuye 时间: 2012-1-16 16:24
网速太慢，放不了，哪里能下载哦？作者: 天子的贝贝 时间: 2012-1-17 09:15
速度相当的慢啊，受不了啦作者: xulei2008 时间: 2012-1-18 10:00
heart attack and stroke ,?作者: keshimian 时间: 2012-1-31 22:04
