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.
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.
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4. 面包刀的刀刃应带有波浪齿。
Bread knives should have a serrated edge.
《柯林斯英汉双解大词典》
5. 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.
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6. 前齿轮有44个齿。
The front cog has 44 teeth.
《柯林斯英汉双解大词典》
7. 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.
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8. 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.
《柯林斯英汉双解大词典》
9. 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.
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10. 米老鼠开始是又丑又小的噬齿动物。
Mickey Mouse starts as an ugly, little rodent.
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11. 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.
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.
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13. 扁平的颊齿把树叶磨碎。
Flat cheek teeth ground up the leaves.
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14. 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.
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15. 这些被称为同型齿的牙齿。
These are called homodont teeth.
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16. 白发农民露出缺齿的微笑。
The white-haired farmer laughed toothlessly.
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17. 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/.
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18. 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.
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19. 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.
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20. 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.
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21. 一个齿轮的齿与另一齿轮的齿相啮合。
The teeth in one wheel engage with those of another.
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22. 米老鼠开始是又丑又小的噬齿动物。
Mickey Mouse starts off as an ugly, little rodent.
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23. 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.
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24. 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.
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25. 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.
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26. “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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27. 使用宽齿的梳子来梳理头发。
Use a wide-toothed comb rather than a brush to untangle hair.
