牙齿有一层叫做釉质的坚硬表层。
他突然一笑，露出一口雪白的牙齿。
He smiled suddenly, exposing a set of amazingly white teeth.
牙医建议大家每六个月检查一次牙齿。
Dentists advise you to have your teeth checked every six months.
我们一点也不担心糖果可能会腐蚀牙齿。
We were not in the least worried about the possibility that sweets could rot the teeth.
沃尔什一笑露出了牙齿。
牙齿上的空洞是由龋蚀造成的。
乔希露出尖尖的牙齿，恶狠狠地咆哮着。
它是一种覆盖在牙齿上的粘性无色薄膜。
水獭奥特笑了，露出一排亮晶晶的白牙齿。
The Otter showed a gleaming set of strong white teeth as he laughed.
他咬人时，牙齿就痛。
它们把糖转化成酸，酸会腐蚀较硬的牙齿外层。
They change sugar into acids, which break down the tooth's harder outer covering.
她还接触了牙医，学习更多关于牙齿清洁的知识。
She also approached dentists to learn more about teeth cleaning.
牙医没有把牙齿扔进废纸篓，而是把它们寄给我们。
Instead of throwing the teeth in the wastebasket, the dentists send them to us.
为了脱身，其余的壳就会以逆时针方向绕着牙齿旋转。
The rest of the shell is rolled towards the tooth in an anticlockwise direction, in order to remove it.
当我们的牙齿全部脱落后，我们就不再吃糖果和巧克力了。
We stop eating candies and chocolates when all of our teeth have fallen off.
非洲人整天把一根小木棍放在嘴里咀嚼或刷洗他们的牙齿。
Africans keep a small stick in their mouth to chew or scrub their teeth all day.
当她睁开眼睛时，她看到蒂姆医生握着她的牙齿，微笑着。
When she opened her eyes, she saw Doctor Tim holding her tooth, smiling.
它们紧紧地抓住猎食者的腹部，用牙齿和爪子紧紧抓住不放。
They cling to the belly of their oppressor and hang on with tooth and claw.
他知道一旦上了山，他就很容易被追上，狼的牙齿会撕咬他的肉。
He knew that once he hit the hill, he’d be easy caught up and the wolf’s teeth would be tearing into his flesh.
继续往下读，看看你能做些什么来让你珍珠般洁白的牙齿闪闪发光。
Read on to find out what you can do to keep your pearly white teeth sparkling.
在这个阶段，牙齿可以借助唾液中的氟化物和矿物质修复脆弱的部位。
At this stage, the tooth can repair the weakened area with the help of fluoride and minerals in saliva.
生物人类学家克里斯蒂·特纳是分析人类牙齿的物理特性变化的专家。
The biological anthropologist Christy Turner is an expert in the analysis of changing physical characteristics in human teeth.
它窄长的头骨、没有牙齿的尖颌和短短的颈椎表明，它与无齿翼龙类似。
Its elongated skull with toothless tips and short cervical vertebrae indicate that it is similar to that of Pteranodon.
尽管我明白吃太多巧克力对牙齿不好，但我还是抵挡不住巧克力的诱惑。
I just cannot resist chocolate, even though I know eating too much of it will do harm to my teeth.
用牙线清洁一下你的牙齿——这是个所需时间很少但我们不经常做的行为。
Flossing your teeth—this is an act that takes very little time but we don't often do.
糖通过被那些存在我们牙齿的引起斑块的细菌作为一种食物来源，可以导致牙齿腐烂。
Sugar can cause tooth decay by being used as a food source for the bacteria found on our teeth, which causes plaque.
它们有不同的形状、大小、颜色、鳍、牙齿、栖息地、饮食、性格、繁殖方式和其他属性。
They have different shapes, sizes, colors, fins, teeth, habitat, diet, personality, method of reproduction, and other attributes.
它们有不同的形状、大小、颜色、鳍、牙齿、栖息地、饮食、性格、繁殖方法和其他属性。
They have different shapes, sizes, color, fins, teeth, habitat, diet, personality, method of reproduction, and other attributes.
他的牙齿有毛病。
这些食肉鱼类牙齿锋利。
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