名词：

Irregular:

teethplural /tiːθ/DJ /tiθ/KK

any of the hard white objects in the mouth used for biting and chewing food 牙；齿

I've just had a tooth out at the dentist's. 我刚在牙科诊所拔了一颗牙。

to brush/clean your teeth 刷牙

tooth decay 龋齿

false teeth 假牙

She answered through clenched teeth(= opening her mouth only a little because of anger). 她咬牙切齿地回答。

The cat sank its teeth into his finger. 那只猫狠狠咬住了他的手指。

a narrow pointed part that sticks out of an object 齿状部份；齿

the teeth on a saw 锯齿

Idiom:

cut your teeth on sth

to do sth that gives you your first experience of a particular type of work 从…中获得初步经验；初次涉足

She cut her teeth on local radio. 她初次涉足当地电台。

Idiom:

cut a tooth

of a baby 婴儿 to grow a new tooth 出牙；长出新牙

Idiom:

get your teeth into sthinformal

to put a lot of effort and enthusiasm into sth that is difficult enough to keep you interested 专注于，全力投入（有一定难度的事）

Choose an essay topic that you can really get your teeth into. 选择一个你可以真正悉心钻研的论文题目。

Idiom:

have teethBritish English, informal

of an organization, a law, etc. 组织、法律等 to be powerful and effective 具有强大威力；有杀伤力

Idiom:

in the teeth of sth

in spite of problems, opposition, etc. 不管，不顾（困难、反对等）

The new policy was adopted in the teeth of fierce criticism. 新政策尽管受到强烈的批评，但还是被采用了。

in the direction that a strong wind is coming from 顶着，迎着（强风）

They crossed the bay in the teeth of a howling gale. 他们顶着呼啸的狂风渡过了海湾。

Idiom:

set sb's teeth on edge

of a sound or taste 声音或味道 to make sb feel physically uncomfortable 使感到身体不舒服