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.

我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，海豹能刮掉新冰，保持洞口畅。

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

每当我咬西的时候，比如一个苹果，我我的门牙。

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.

我长出的第一颗牙齿是门牙，在我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.

马前面的切牙咬断草，后面的磨牙将草嚼碎，之间的缝隙可以来咬别的西。

Premolars are bigger than canines and incisors.

前磨牙比尖牙和门牙大。

I have this thing with my molars mostly, but also a bit on my incisors.

我主要是智齿有问题，但也有一点是门牙。

I didn't have the guts to do it on my canine incisor.

我没有勇气在我的犬牙上这么做。

When you're carefully scraping tartar off someone's incisors.

当你小心翼翼地刮除某人门牙上的牙石时。

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?

兰纳德你想过为啥我的小脚趾和侧门牙要比和我一号的人小很多吗？

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

而且巨型海狸的门牙比现存海狸的大且更弯曲。

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

像所有啮齿动物一样，巨型海狸上下颌都有不断生长的大门牙。

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厘米以上！