我想把拉链齿露在外面，不要盖儿。
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.
面包刀的刀刃应带有波浪齿。
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.
前齿轮有44个齿。
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。
白发农民露出缺齿的微笑。
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.
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.
扁平的颊齿把树叶磨碎。
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.
这些被称为同型齿的牙齿。
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.
一个齿轮的齿与另一齿轮的齿相啮合。
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.
最近的研究表明：长寿跟用牙线洁齿直接相关。
Recent studies make a direct connection between longevity and teeth flossing.
“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.
“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.
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