Canines are four teeth which sit next to the incisors.

尖牙是位于门牙旁边的四颗牙齿。

Premolars are bigger than canines and incisors.

前磨牙比尖牙和门牙大。

The very first teeth we grow are incisors, appearing when we are around 6 months old.

长出的第一颗牙齿是门牙，在六个月左右的时候出现。

A mole rat's incisor teeth can move on their own, working together like chopsticks.

鼹鼠的门牙可以自行移动，像筷子一样共同工作。

All eight of our incisor teeth are located in the front part of our mouth.

所有的八颗门牙都位于口腔的前部。

Whenever we sink our teeth into something, such as an apple, we use our incisor teeth.

每当咬东西的时候，比如一个苹，就用的门牙。

And their teeth evolved into different shapes and unique combinations, like canines and incisors.

他的牙齿演变成不同的形状 和独特的组合，如犬齿和门牙。

And Castoroides had incisors that were bigger and curvier than those of living beavers.

Castoroides 的门牙比海狸的门牙更大、更弯曲。

The giant beaver's incisors could grow to be over 20 centimeters long!

巨型海狸的门牙可以长到20多厘米！

Leonard, have you ever wondered why my little toes and lateral incisors are significantly smaller than the average for someone of my size?

兰纳德你想过为啥的小脚趾和侧门牙要比和一号的人小很多吗？

Incisors and cuspids are in front of the mouth; molars are in the back.

门牙和尖牙位于嘴前; 磨牙在后面。

All so their modified incisors can be used as a raw material for art in Asia or the bows of string instruments in Europe.

这样一来，加工过的象牙可被当做亚洲艺术的原材料或欧洲弦乐器里的饰片。

Like all rodents, Castoroides had big incisors on its upper and lower jaws that never stopped growing.

像所有的啮齿动物一样，Castoroides 的上下颌都有大门牙，并且从未停止生长。

So Malek wore fake teeth to account for Mercury's additional four incisors.

因此，Malek 戴上了假牙来解决 Mercury 额外的四颗门牙的问题。

And on each side of the upper jaw, it had five incisors lined up in front of a large canine tooth.

在上颚的每一侧，它有五颗门牙，排列在一颗大犬齿前面。

The paper reports that “the common finding was a narrowing of the mandibular dental arch and a decrease in maxillary arch length, causing an incisor cross-bite.”

“最遍的情况是下颌牙弓变窄，上颌弓内缩，从而导致门牙反咬合。”

Then it chews a hole into the bark with its rodent-like incisors, sticks that skinny finger into the hole and pull out grubs.

然后它用啮齿动物般的门牙在树皮上咬出一个洞，将那根瘦骨嶙峋的手指伸进洞里，然后拉出幼虫。

Up front, it had long, canine-like teeth for killing prey, but it also had distinct incisors and teeth in back that pointed backward, perfect for dismembering carcasses.

在前面， 它有长长的犬齿状牙齿用于杀死猎物，但它也有明显的门牙和向后指的牙齿，非常适合肢解尸体。

See, in most of the rest of the world, predatory mammals – which are mostly in the order Carnivora – have small incisors and big canines.

你看， 在世界其他大部分地区，食肉哺乳动物（大部分属于食肉目）拥有小门牙和大犬齿。

Most adults have 32 teeth called permanent or secondary teeth; 8 incisors, 4 canines, also called cuspids, 8 premolars, also called bicuspids, 12 molars, including 4 wisdom teeth whereas children have 20 teeth.

大多数成年人有 32 颗牙齿，称为恒牙或副牙；8 颗门牙，4 颗尖牙也叫犬牙，8 颗前磨牙，也称为双尖牙，12 颗臼齿，包括 4 颗智齿，而儿童有 20 颗牙齿。