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