★英語(yǔ)聽(tīng)力頻道為大家整理的初中英語(yǔ)聽(tīng)力材料：細(xì)菌鐘愛(ài)你的嘴，供大家參考。更多閱讀請(qǐng)查看本站英語(yǔ)聽(tīng)力頻道。
Did you know that there could be more bacteria living in your mouth than there are people on earth?
你知道嗎，寄居于你口中的細(xì)菌有可能比全世界的人口數(shù)還多？
Bacteria love our mouths because the livin’ is easy–there’s plenty of food and water, and a fairly constant temperature of 95 degrees. The vast majority of these bacteria don’t cause any problems. Some even do community service, cleaning out the food between our teeth without harming the teeth at all!
細(xì)菌鐘愛(ài)我們的嘴是因?yàn)榭谇恢械沫h(huán)境很舒適，不僅有充足的食物及水，其溫度也穩(wěn)定在95華氏度。口腔內(nèi)絕大多數(shù)的細(xì)菌不會(huì)產(chǎn)生什么問(wèn)題。有一部分甚至是有益的，義務(wù)清理牙縫中的食物殘?jiān)?，保護(hù)我們的牙齒！
But there is one type of bacteria that wreaks havoc in the mouth by causing cavities. Like most people, the bacterium streptococcus mutans loves to eat sugar. In the process, it converts sugar to an acid that corrodes teeth and causes cavities. Saliva can neutralize some of that acid and prevent it from damaging teeth.
但是有一種細(xì)菌會(huì)對(duì)口腔形成危害，造成蛀牙。細(xì)菌中的變形鏈球菌與許多人一樣喜愛(ài)吃糖，通過(guò)將糖轉(zhuǎn)化為酸，進(jìn)而腐蝕牙齒，形成蛀洞。唾液能夠中和部分酸以防牙齒被損害。
But these days, most of us eat so much sugar that our saliva can’t neutralize all the acid that streptococcus mutans produces.
然而現(xiàn)在大部分人攝入的糖分過(guò)多，以至于唾液無(wú)法中和所有的酸，變形鏈球菌隨即而生。
What’s a sugar addict to do?
那么愛(ài)吃糖的人該怎么辦呢？
If you brush and floss every day, that physically disrupts the colonies of bacteria enough to keep the populations under control, somewhere between one thousand and one hundred thousand per tooth. The fluoride in toothpaste and tap water hardens tooth enamel, making it more resistant to the acid produced by streptococcus mutans.
如果你每天刷牙并使用牙線清理牙齒，可有效阻斷細(xì)菌繁殖，將每顆牙的細(xì)菌數(shù)控制在一千至十萬(wàn)。牙膏中的氟化物及自來(lái)水也能夠堅(jiān)固牙釉質(zhì)，使牙齒更好的抵御變形鏈球菌所產(chǎn)生的酸。
Fluoride also helps saliva repair parts of the tooth that have already been damaged by the acid. And, last but not least, it helps not to feed the critters too much of their favorite food: sugar!
氟化物還能夠幫助唾液修復(fù)被酸損害的部分牙齒。最重要的一點(diǎn)就是不要給細(xì)菌它們的最?lèi)?ài)——糖。
Did you know that there could be more bacteria living in your mouth than there are people on earth?
你知道嗎，寄居于你口中的細(xì)菌有可能比全世界的人口數(shù)還多？
Bacteria love our mouths because the livin’ is easy–there’s plenty of food and water, and a fairly constant temperature of 95 degrees. The vast majority of these bacteria don’t cause any problems. Some even do community service, cleaning out the food between our teeth without harming the teeth at all!
細(xì)菌鐘愛(ài)我們的嘴是因?yàn)榭谇恢械沫h(huán)境很舒適，不僅有充足的食物及水，其溫度也穩(wěn)定在95華氏度。口腔內(nèi)絕大多數(shù)的細(xì)菌不會(huì)產(chǎn)生什么問(wèn)題。有一部分甚至是有益的，義務(wù)清理牙縫中的食物殘?jiān)?，保護(hù)我們的牙齒！
But there is one type of bacteria that wreaks havoc in the mouth by causing cavities. Like most people, the bacterium streptococcus mutans loves to eat sugar. In the process, it converts sugar to an acid that corrodes teeth and causes cavities. Saliva can neutralize some of that acid and prevent it from damaging teeth.
但是有一種細(xì)菌會(huì)對(duì)口腔形成危害，造成蛀牙。細(xì)菌中的變形鏈球菌與許多人一樣喜愛(ài)吃糖，通過(guò)將糖轉(zhuǎn)化為酸，進(jìn)而腐蝕牙齒，形成蛀洞。唾液能夠中和部分酸以防牙齒被損害。
But these days, most of us eat so much sugar that our saliva can’t neutralize all the acid that streptococcus mutans produces.
然而現(xiàn)在大部分人攝入的糖分過(guò)多，以至于唾液無(wú)法中和所有的酸，變形鏈球菌隨即而生。
What’s a sugar addict to do?
那么愛(ài)吃糖的人該怎么辦呢？
If you brush and floss every day, that physically disrupts the colonies of bacteria enough to keep the populations under control, somewhere between one thousand and one hundred thousand per tooth. The fluoride in toothpaste and tap water hardens tooth enamel, making it more resistant to the acid produced by streptococcus mutans.
如果你每天刷牙并使用牙線清理牙齒，可有效阻斷細(xì)菌繁殖，將每顆牙的細(xì)菌數(shù)控制在一千至十萬(wàn)。牙膏中的氟化物及自來(lái)水也能夠堅(jiān)固牙釉質(zhì)，使牙齒更好的抵御變形鏈球菌所產(chǎn)生的酸。
Fluoride also helps saliva repair parts of the tooth that have already been damaged by the acid. And, last but not least, it helps not to feed the critters too much of their favorite food: sugar!
氟化物還能夠幫助唾液修復(fù)被酸損害的部分牙齒。最重要的一點(diǎn)就是不要給細(xì)菌它們的最?lèi)?ài)——糖。