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。

And then we have central incisors and laterals just on the outsides.

然后是中切牙和外侧的侧切牙。

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。

With these razor-sharp incisors, a seal is able to scrape away fresh ice and keep the hole open.

有了这些锋利的门牙，海豹就能刮掉新冰，保持洞口畅通。

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

每当咬东西的时候，比如一个苹果，就用的门牙。

Canines are four teeth which sit next to the incisors.

尖牙是位于门牙旁边的四颗牙齿。

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。

Their teeth snip grass with front incisors and crush it with back molars, leaving a useful gap for a bit.

马用前面的切牙咬断草，用后面的磨牙将草嚼碎，之间的缝隙就可以用来咬别的东西。

Premolars are bigger than canines and incisors.

前磨牙比尖牙和门牙大。

Both canines and incisors, grow up to 50cm long in an adult male.

成年雄性的犬齿和门牙均可长至 50 厘米长。

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。

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。

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小很多吗？

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

Castoroides 的门牙比活海狸的门牙更大、更弯曲。

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。

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。

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！

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。

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。