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

鼹鼠门牙可以自行移动，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侧切牙。

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

我们所有八颗门牙都位于口腔。

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.

每当我们咬西时候，比如一个苹果，我们就用我们门牙。

Canines are four teeth which sit next to the incisors.

尖牙是位于门牙旁边四颗牙齿。

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

我们长出第一颗牙齿是门牙，在我们六个月左右时候出现。

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

马用面切牙咬断草，用后面磨牙将草嚼碎，之间缝隙就可以用来咬别西。

Premolars are bigger than canines and incisors.

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牙石时。

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

成年雄性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; 磨牙在后面。

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

他们牙齿演变成不同形状 和独特组合，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小脚趾和侧门牙要比和我一号人小很多吗？

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

而且巨型海狸门牙比现存海狸大且更弯曲。

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长大门牙。

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，加工过象牙可被当做亚洲艺术原材料或欧洲弦乐器里饰片。

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

巨型海狸门牙可以长到20厘米以上！