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.
钟摆的运动使这个装置晃动，如此一来这个装置能抓住擒纵轮的每一个齿，随后又将其释放，因而使其精确转动一段距离。
The motion of a pendulum rocks this device so that it catches and then releases each tooth of the escape wheel, in turn allowing it to turn a precise amount.
如果嵌齿不能完好啮合，齿轮就会脱落。
If the cogs don't mesh correctly, the gears will keep slipping.
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.
牙刷轻轻地刷去齿菌斑，没有伤及牙床或引起出血。
The toothbrush gently removes plaque without damaging the gums or causing bleeding.
你可以付通行费开车上派克斯峰公路，或者放松一下，乘坐派克斯峰齿轨式火车。
You can pay a toll to drive on Pike's Peak Highway or relax and take the Pike's Peak Cog Railway.
米老鼠开始是又丑又小的噬齿动物。
四齿鲀科族里共有超过90个河豚鱼种类。
There are over ninety species of pufferfish all belonging to the family Tetraodontidae.
如果有人能在人类篝火的炭火旁发现一具肋骨插着矛尖的双原齿动物骨架，或者发现袋狼的骨头，那将会很有帮助。
It would be helpful if someone uncovered a Diprotodon skeleton with a spear point embedded in a rib — or perhaps Thylacoleo bones next to the charcoal of a human campfire.
配体在配合物中以四齿方式进行配位。
The ligand is coordinated in a tetradentate manner in the complex.
白发农民露出缺齿的微笑。
唇齿音由下唇与上齿连接发出，例如 /f/。
The labio-dental sounds are articulated by the lower lip against the upper teeth, eg. /f/.
牙科修复学家设计、修复和安装假齿和护齿套。
Prosthodontists design, repair, and install dentures and mouthguards.
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.
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.
米老鼠开始是又丑又小的噬齿动物。
异齿兽类生活在地面和树林中。
Anomodonts lived both on the surface of the ground and in trees.
继续用短齿梳剪将头发剪短打薄。
Continue using the shorter comb gauge to fade the hair lighter and shorter.
使用宽齿的梳子来梳理头发。
Use a wide-toothed comb rather than a brush to untangle hair.
棘轮上的每一个齿有两个边，一个向上，一个向下。
Each tooth on a ratchet has two sides, one that goes up and one that goes down.
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.
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.
口香糖能够增加唾液分泌，有助消灭齿菌斑。
The gum can stimulate saliva flow, which helps fight plaque .
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.
八齿鼠父亲的行为表现就像人类的父亲一样。
另见“奇异剑齿兽被发现——食的是……草？”
See "Odd Saber-Toothed Beast discovered-preyed on... Plants?"
实际光学频率梳横跨整个可见光谱，各齿极细并均匀分布。
A real optical frequency comb spans the entire visible spectrum of light, and has very fine, evenly spaced teeth.
脉冲重复率越高，齿间距越大，各个齿之间也越容易分辨。
The faster the pulse repetition rate, the wider the spacing between the teeth, making each individual tooth easier to identify.
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.
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.
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