白发农民露出缺齿的微笑。
这些被称为同型齿的牙齿。
使用宽齿的梳子来梳理头发。
Use a wide-toothed comb rather than a brush to untangle hair.
鲨鱼的皮肤是由被称之为肤齿的微小鳞屑所构成。
Shark skin is made of tiny scales known as dermal denticles that can be seen here.
苹果还有牙刷作用，洁齿和杀灭口腔细菌，减少龋齿的危险。
Apples also act as a toothbrush, cleaning teeth and killing bacteria in the mouth, which may reduce the risk of tooth decay.
NASA说乘员已经下传了有关一个断了两个齿的小型星型齿轮的视频和图像。
NASA said the crew had sent down video and photographs of a small star-shaped gear with two broken teeth.Experts were trying to determine whether it was related to the problem.
NASA说乘员已经下传了有关一个断了两个齿的小型星型齿轮的视频和图像。
NASA said the crew had sent down video and photographs of a small star-shaped gear with two broken teeth. Experts were trying to determine whether it was related to the problem.
不过，科学家们认为，尽管沙锥齿鲨锋牙利齿的外表很吓人，但它们实际上是性情温和的动物，只有被激怒时才会咬人。
Biologists from Macquarie University in Sydney insist that grey nurse sharks, while terrifyingly toothy in appearance, are mild creatures which will bite humans only if provoked.
正牙医师从比利的口腔内部取了模型来制作齿板。
An orthodontist took a cast of the inside of Billy's mouth to make a dental plate.
佩戴护齿牙夹板是治疗夜间磨牙症的第二步。
Wearing a dental guard or splint at night is usually the next step for bruxism.
这些植物，开有圆形的白色花簇，如欧洲荚莲和齿叶荚莲的某几个品种。
These plants have rounded clusters of white flowers, as the guelder rose and certain species of the arrowwood.
科学家们表示，史前人类的饮食可能需要更多咀嚼齿。
Scientists say the diet of prehistoric humans probably required more chewing teeth.
一个链轮(212)包括一个轮毂和多个从轮毂径向向外突出的齿。
A sprocket (212) includes a hub and a plurality of teeth projecting radially outwardly from the hub.
这种异齿属的物种可见于泰国全境多岩石的急流中，据认为在邻近国家也有。
The new species of the Oreoglanis genus, was found in rocky, fast-flowing streams all over Thailand, and is thought to be present in neighbouring countries as well.
这种测量工具用以测量奇数齿齿轮的齿顶圆和齿根圆直径。
The measuring instrument can measure addendum circle and dedendum circle diameter of odd-tooth gears.
2008年的研究表示巨齿鲨的咬合力空前绝后——强大到甚至可以粉碎一辆汽车。
A 2008 study found that the megalodon shark had the most powerful bite of any known creature that ever lived-strong enough to crush a small car.
看哪，我已使你成为有快齿打粮的新器具，你要把山岭打得粉碎，使冈陵如同糠。
Behold, I will make thee a new sharp threshing instrument having teeth: thou shalt thresh the mountains, and beat them small, and shalt make the hills as chaff.
随着幼鼠长大，八齿鼠父亲开始积极地与学步的子女玩耍。
And as the pups get older, the degu fathers begin actively playing with their toddler offspring.
与鲸类和海牛这些海生哺乳动物不同，鲨鱼的皮肤不会附生海藻或藤壶，这可能要归结于其皮肤上被称之为“肤齿”的微小鳞屑。
Unlike the skin of whales and manatees, shark skin doesn't pick up algae or barnacles. This seems to be due to little scales called "dermal denticles."
有些鹦鹉螺化石上的齿痕看起来好像是由巨大的爬虫类捕食者沧龙留下的。
Some ammonite fossils have tooth marks that look as though they were made by huge reptilian predators called mosasaurs.
扁平的颊齿把树叶磨碎。
美洲巨型动物的消失——猛犸象、剑齿猫、巨型树懒等等——发生在人类出现后不久，大约在一万三千年前。
The disappearance of megafauna in America—mammoths, saber-toothed cats, giant sloths, among others—happened relatively soon after the arrival of human beings, about 13,000 years ago.
一个齿轮的齿与另一齿轮的齿相啮合。
“剑齿松鼠”的研究现已发表于《自然》杂志。
The "saber-toothed squirrel" study was published today in the journal Nature.
用此脉冲产生的频率梳横跨数十万的频率范围(或齿)，能够灵活精确的测量十分宽泛多样的现象。
The resulting comb spans several hundred thousand frequencies, or teeth, enabling flexible and accurate measurements of wide-ranging or widely varied phenomena.
沙蚕的颌齿是由蛋白质跟锌离子结合而成。
Ragworm jaws are made of a mixture of protein and zinc ions.
这只上龙的头比霸王龙的大一倍，满口是令人印象深刻12英寸长的巨齿。
The pliosaur's head was twice as big as that of a Tyrannosaurus rex and was filled with an impressive set of 12-inch teeth.
在它们扁圆头部的前端有一对弯曲的尖牙作为颌齿，用来俘获甲壳类生物并将其撕碎。
At the front of their bulbous blue heads they have curved fangs that act as jaws. They use these to capture and tear apart their crustacean prey.
在它们扁圆头部的前端有一对弯曲的尖牙作为颌齿，用来俘获甲壳类生物并将其撕碎。
At the front of their bulbous blue heads they have curved fangs that act as jaws. They use these to capture and tear apart their crustacean prey.
应用推荐