The tongue tip is down here, touching the back of the bottom front teeth.

头在这下，碰到下前排牙齿後方。

Die. Then the front of the tongue arches towards the front of the roof of the mouth while the tip of the tongue stays down behind the bottom front teeth. Die。

然后头前部向上颚前部抬起，同时尖停留在门牙根部。

The tongue tip is down, lightly touching the back of the bottom front teeth.

尖向下，轻触下齿。

Oh, wow! Look at these really big front teeth, here and here.

哦, 哇! 看看这些巨大门牙，这里和这里。

Squirrels have four front teeth that grow for their entire lives.

松鼠有四颗门牙，它们一生都在生长。

With an f consonant sound, as in 'fork', and 'from' and 'fry' the lower lip touches the underside of the upper front teeth but loosely, so there's a little bit of space through which the breath travels.

以 f 辅音发音，如“fork”，“from”和“fry”，下唇接触上门牙下侧，但松，所以有一点空间让呼吸通过。

I think you will have two front upper teeth soon.

我想你快就会有两颗在上门牙。

You see, sloths don't have front teeth to chew up those leaves.

你看，树懒并没有前齿可以咀嚼那些叶子。

As rodents, beavers have powerful front teeth.

作为啮齿类动物，海狸有强有力门牙。

The front teeth are dagger-shaped with serrated edges designed to tear flesh.

门牙形如匕首边缘呈锯齿状，用以撕咬血肉。

The front teeth are as long as those of a Tyrannosaurus Rex.

前牙齿跟雷克斯暴龙一般长。

This R is made with a flap of the tongue on the ridge behind the front teeth, that's not too far away from where the L is pronounced.

这个 R 音是由头在门牙后尖上拍动而成，离 L 发音位置并不远。

Manatees have no front teeth. They don't need them because they don't eat meat.

海牛没有门牙。它们不需要门牙，因为它们不吃肉。

And last, but certainly not least, was Ava… with her two, big front teeth.

最后，但肯定不是最不重要，是艾娃… 她两个大门牙。

She was also smiling - rather nervously, it was true - but the reduction in the size of her front teeth was more noticeable than ever; Harry couldn't understand how he hadn't spotted it before.

她还在微笑（相当紧张，这可是真），但她前排牙齿变小了，这会儿比以前更明显了，哈利不明白为什么他之前没发现。

They obtain the wood for their dams and huts by gnawing through the branches of trees, and even through the trunks of small ones, with their sharp front teeth.

海狸用自己那尖而长前牙不断地噬咬大树细枝，它们甚至还会咬断小树主干，从而为自己小屋和水坝储存木材。

They thought it was neat until my husband taught them how to rinse by spitting out water between their two front teeth like a fountain.

他们认为那样刷好玩，直到有一天我先生教他们如何漱口——从两颗门牙之间把水像喷泉一样喷出来，他们认为这才叫做好玩。

So the red is bad, green is good, and we call the front teeth the anterior teeth, and the back teeth are posterior teeth.

因此，红色代表坏牙，绿色代表好牙，我们称前牙齿为前牙，后牙齿为后牙。

He informed me that he was the one who had knocked out my front teeth when I was first brought to the ward.

他告诉我，当我第一次被送到病房时，就是他打掉了我门牙。

The very next day, in a fit of rage, the student knocked out one of her teacher's front teeth.

就在第二天，在一怒之下，这个学生把老师一颗门牙打掉了。