1.tooth的基本意思是“牙,齿”,其复数形式是teeth,但由tooth构成的复合词在变成复数时,则只需将主体名词变成复数形式。
2.tooth也可作“齿状物; (齿轮、锯、梳、耙等的)齿”解。
3.tooth还可作“嗜好,胃口”解。

I went to my dentist to have a tooth taken out.我去找牙医拔了一颗牙。
I've been troubled by a bad tooth.有颗坏牙一直使我不舒服。
One of my front teeth is giving me trouble.我的一颗门牙很痛。
His tooth ached all night.他的牙疼了一整夜。
My tooth has just come out. 我的牙刚掉下来。
I can feel the hole in my tooth with my tongue.我用舌头可以舔到我牙齿中的缝。
He cried with pain when the dentist pulled his tooth out.当牙医给他拔牙时,他疼得叫起来。
His high temperature delayed having an infected tooth out.他由于发高烧推迟拔掉一颗受感染的牙齿。
The dentist took out two of my teeth and asked me to come back again to have further treatment. 牙医拔掉了我两颗牙,并让我再来做进一步的治疗。
Ian's having three teeth taken out tomorrow.明天,伊恩要拔除3颗牙。
Fighting tooth and nail, the peasants refused to go down before the invaders.农民们不甘为入侵者所征服而作殊死的斗争。
It is an eye for an eye and a tooth for a tooth.以眼还眼,以牙还牙。
They are armed to the teeth.他们是全副武装。
She clenched her teeth.她咬紧牙关。
Who broke a tooth of this saw?谁把这锯子的一个齿弄断了?
The law must be given more teeth if crime is to be properly controlled.要想有效控制住犯罪活动,就得加强法制的威力。
She has a sweet tooth.她有吃甜食的嗜好。

1.我们用牙齿咬噬咀嚼。
［误］  We use our tooth for biting and chewing.
［正］  We use our teeth for biting and chewing.
［析］  tooth的复数是 teeth,这里应该用复数形式。
2.我妹妹有两把牙刷。
［误］  My sister has two teethbrushes.
［正］  My sister has two toothbrushes.
［析］  tooth的复数是teeth,但由tooth构成的复合词在变成复数时,则只需将主体名词变成复数形式。

［同义词］   cog
［词源］  ＜古英语toth(牙齿)