Many carnivorous dinosaurs have ambiguous features, such as "peg-like" teeth at the front of the mouth, or no teeth at all.
许多食肉恐龙的特征并不是很明显，例如，要么在嘴的前部有“钉状牙齿”，要么就根本没有牙齿。
523 students cleaned their teeth within ten minutes of eating. When possible, they used a toothbrush; when this was impossible, they washed their mouth thoroughly with water.
523名学生在吃饭后十分钟内刷牙。如果情况允许的话，他们会使用牙刷；否则，他们会用水彻底清洗口腔。
But many theropod dinosaurs have ambiguous features, such as peg-like teeth at the front of the mouth, or no teeth at all.
但是，许多食肉恐龙的特征并不是很明显，例如：要么在嘴的前部有“钉状牙齿”，要么就根本没有牙齿。
These early pterosaurs all had a mouth full of teeth, usually small at the back and larger at the front.
这些早期翼龙嘴里都长满了牙齿，通常来说，小的牙齿长在后面，大的牙齿长在前面。
Saliva - Your mouth and teeth are constantly bathed in saliva.
唾液—你的口腔和牙齿都不断被唾液洗刷。
The same is true for eyes, eyebrows, ears, mouth, hair, teeth, necks, chins, shoulders, arms, hands, stomach, thighs, calves, feet and all the other observable body parts.
同样的事情也发生在眼睛、眉毛、耳朵、嘴、头发、牙齿、脖子、下巴、肩膀、胳膊、手、肚子、大腿、小腿、脚和其他所有可以被看到的身体部位。
Bacteria in your mouth feed on sugars and starches that remain on your teeth after eating.
你口腔中的细菌靠你牙齿里残留食物的糖分和淀粉存活。
Aristotle could have avoided the mistake of thinking that women have fewer teeth than men, by the simple device of asking Mrs. Aristotle to keep her mouth open while he counted.
亚里斯多德认为女人的牙齿比男人少，其实很简单，只需请亚里斯·多德夫人张一张口来让他数一数，他本是可以不犯这一错误的。
Both its mouth and tongue are lined with small, sharp teeth, preventing the prey from making a getaway.
它的嘴和舌头上都排列着小而尖的牙齿，以防止猎物逃跑。
Saliva helps protect teeth and gums from bacteria that cause cavities and gingivitis. So a perpetually dry mouth is more susceptible to tooth decay and gum disease.
唾液可以保护牙齿免受引发牙齿腔洞和牙龈炎的细菌感染，所以长期干燥的口腔更易患这两种疾病。
Remember, early detection and treatment of problems with your gums, teeth and mouth can help ensure a lifetime of good oral health.
记住，及早发现和治疗牙龈、牙齿和口腔疾病才能确保您一生口腔健康。
If your teeth have become more sensitive or your mouth is irritated after brushing, try changing toothpastes.
如果刷牙后你的牙齿或者口腔更为敏感，换个牙膏试试。
In addition to daily brushing and flossing, consider using an antimicrobial mouth rinse to help reduce plaque between your teeth.
除了每日刷牙和用牙线清洁之外，还应考虑使用抗菌漱口水，这样可以抑制牙菌斑生成。
This strange animal of Australia has a mouth similar to the bill of the duck. Its bill is soft and it has no teeth in the mouth.
澳大利亚的这种奇怪的动物的嘴巴像鸭嘴，而且它的嘴巴是软的，嘴里也没有牙齿。
The Pacific viperfish has jagged, needlelike teeth so outsized it can't close its mouth.
太平洋蝰鱼那锯齿状的针一样的牙齿是如此之大，以至于它不能合上自己的嘴巴。
The molars are the largest teeth in the mouth and are also very strong - there are four at the top and four at the bottom.
臼齿是口腔内较大的牙齿，同样十分坚韧，分布于左右颊部后端，上下各四颗。
He had two triangular pieces of tile in his head, instead of eyes, his mouth was made of an old broken rake, and was, of course, furnished with teeth.
雪人的眼睛是两枚三角形的小瓷片，嘴巴是一把旧耙子做成的，当然喽，耙齿还在。
To prevent your teeth from decaying, you can do two things - strengthen your teeth's defenses with fluoride and sealants, and reduce the number of bacteria in your mouth.
为了预防龋坏的发生，你可以做两件事情——用氟化物和封闭剂增强牙齿保护，减少口腔内细菌。
The last teeth to appear (the second molars, found in the very back of the mouth on the top and bottom) have usually begun coming into place by your baby's second birthday.
到宝宝两岁时，最后的几颗牙齿（臼齿，就是位于口腔后方两侧的牙齿）就都开始各就各位了。
It had feathers and other traits of living birds but also vestiges of a reptilian past, such as teeth in its mouth, claws on its wings, and a long, bony tail.
始祖鸟拥有羽毛，它身上既有现代鸟类的特征，也有远古爬行动物的痕迹，例如口中有牙齿，翅膀上有爪子，还有一条硕长的骨质尾巴。
I can easily see - any fool would see it - that you've not breakfasted, as your teeth and mouth are absolutely clean, not a crumb about.
我轻轻松松就看到这些细节——任何傻瓜都看得见——你还没吃过早餐，因为你的牙齿和嘴角都很干净，没有一点儿面包屑。
His skin was pale, his mouth very expressive, his pale lips barely grazing his teeth.
他皮肤苍白，嘴长的很富有表情，苍白的嘴唇刚好盖住牙齿。
Incisors are the eight teeth at the front of your mouth — four at the top, four at the bottom.
门牙是分布于口腔下颚前方的八颗牙齿，四颗在上，四颗在下。
Apples also act as a toothbrush, cleaning teeth and killing bacteria in the mouth, which may reduce the risk of tooth decay.
苹果还有牙刷作用，洁齿和杀灭口腔细菌，减少龋齿的危险。
These insults, poured forth in a voice roughened by brandy, did, indeed, proceed in hideous wise from a mouth which lacked its two front teeth.
那种恶骂从中了酒毒的哑嗓子里喊出来，确是很丑，那张嘴确也缺少两颗门牙。
The Wolf grinned and showed his teeth and said: “Be content. You have put your head inside a Wolf's mouth and taken it out again in safety; that ought to be reward enough for you.”
“请给我您承诺过的奖励吧”鹤说，狼龇着钢牙冷笑到，“你就知足吧，刚才你把头放进一只狼的嘴里，并且安然无恙的拿了出来，这对你已经是最大的奖励了。”
Terrence Steadman places his false teeth in his mouth and picks up a cordless phone.
TerrenceSteadman将他的假牙放入嘴里，拿起一部无绳电话机。
The most arresting is the wild visage of Pan, eyes wide, mouth open, baring his teeth.
最引人瞩目的是一件风格粗犷的牧羊神(Pan)的画像，双眼圆睁，嘴巴张大，露出牙齿。
To understand what happens when your teeth decay, it's helpful to know what's in your mouth naturally. Here are a few of the elements.
为了理解当你的牙齿龋坏时都发生了什么，了解你口腔的自然状况是有益的。以下是几个基本组成要素。
It looked so alive! It opened its mouth and made the special noise of that animal. It had small sharp white teeth.
它看上去活蹦乱跳！它张开嘴，发出一声这种动物特有的叫声。它长着又小又尖的白牙齿。
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