Wising Up About Wisdom Teeth为题目的作文

Wising Up About Wisdom Teeth

This is the VOA Special English Health Report.

Wisdom teeth are normally the last teeth to appear in the mouth. It usually happens when people are older and wiser. That is, when they are in their late teenage years or early twenties.

Wisdom teeth are molars, or chewing teeth at the back of the mouth. The third set of molars, if you have them, are your wisdom teeth.

They can grow into place normally and never cause a problem. But often there is not enough room for them in the mouth. They might crowd the other teeth. Sometimes they even push through the gums sideways.

An impacted wisdom tooth is one that fails to completely rise through the gums -- the term is erupt. Wisdom teeth that only partly erupt can leave space for bacteria to enter around the tooth. Infection is a risk in these cases.

Experts say people should have their mouths examined between the ages of sixteen and twenty for placement of their wisdom teeth. X-rays can show wisdom teeth below the gums. Those that are not well aligned and become impacted are often removed.

The American Dental Association says removal is generally advised when wisdom teeth only partly break through the gums. Removal is also advised if there is a chance that poorly aligned wisdom teeth will damage other teeth. And removal is called for in cases where fluid collects around a wisdom tooth that is partly or fully below the gum.

But why do we have wisdom teeth if we often need to get them removed? One theory has to do with our diets. Scientists say the diet of prehistoric humans probably required more chewing teeth. Life was probably a little rougher on the teeth back then, too. So it was good to have extras.

The removal of wisdom teeth is performed by oral surgeons. They say if removal is advised, the best time to do it is before the teeth cause any problems or pain.

The American Association of Oral and Maxillofacial Surgeons says young adults are the best candidates for wisdom teeth removal. The group says older patients may be at greater risk for disease in the tissue surrounding the molars.

Patients can have general anesthesia during the operation. Or they might choose to have a local painkiller and remain awake. It may depend on the condition of the wisdom teeth and the number to be removed.

After surgery, there can be swelling of the gums and face and some pain. Both can be treated with cold wraps and medication.

And that's the VOA Special English Health Report, written by Caty Weaver. I'm Faith Lapidus.

智齿一般是口腔中长出的最后一颗牙齿。通常在人越来越年长，越来越聪明的时候出现。也就是，大约在二十岁左右出现。

智齿一般是长在口腔后部的臼齿或者嚼牙。如果你有第三颗磨牙，那就是你的智齿。

他们一般长在比较正常的位置，通常不会造成什么问题。但是通常，口腔里没有足够的空间能够容得下臼齿。它们可能会挤压其他牙齿，有时甚至会冲破牙龈。

阻生智齿是指没有完全萌生的智齿。只有部分萌生的支持会给细菌留下空间，使细菌侵入牙齿周围，在这种情况下容易引发感染。

专家表示，16岁到20岁的人群应该进行口腔检查，确定支持可能萌发的位置。X射线能够确认出智齿在牙龈下的位置。那些位置不均衡，有可能造成阻生的通常会被拔除。

美国牙科协会表示，通常，在智齿不完全萌生的情况下会建议拔除。如果位置不均衡的智齿有可能损害其他牙齿，也建议将其拔除。液体在部分或完全萌生的智齿周围聚集的时候也要求将其拔除。

但是，既然通常情况下都要将智齿拔掉，那么为什么还会长智齿呢？其中一个理论表示跟我们的饮食有关。科学家表示，史前人类的饮食习惯要求有更多的磨牙。那时候的生活可能也更艰难一些，所以，有更多的磨牙还是比较有利的。

口腔及颌面外科医师协会表示，年轻人是拔出智齿的最佳人选。该组织表示，更年长的病人磨牙周围的组织患病的风险更大一些。

拔除智齿一般由口腔医生进行。他们表示，如果需要拔除智齿，最好是在智齿造成任何问题或疼痛之前。

在手术过程中病人可以采取整体麻醉。或者他们可以选择止痛药，可以保持清醒。这取决于智齿的状况和需要拔除的.数量。

手术过后，牙龈和面部可能会有些浮肿，也会有点疼痛，这都可以用冰袋或者药物治疗。

n.树胶,橡皮,橡皮糖,牙床,上帝

例句：Cement's main roles are to anchor the tooth in the gum and to help form new teeth.

粘固粉的主要作用是让牙齿固定在牙龈上，帮助形成新的牙齿。

ways ad.向旁边,斜地里,向侧面地

例句：He chopped accross the ball to make it spin sideways.

他切了一下球，让它朝一边旋转。

t v.爆发，萌发

n v.排列,排成一行,结盟

例句：She neatly aligned the flower pots on the window sill.

她把花盆整齐地排成一行在窗台上。

val n.移动,搬动;迁居;除掉,切除;排除

例句：Surgical removal of the posterior arch of a vertebra.

椎板切除术切除脊椎后弓的手术

istoric a.史前的;旧式的

例句：This prehistoric animal grew a thick protective covering.

这种史前动物长着一层厚厚的保护性外皮。

ounding adj.周围的

例句：Land surrounding the lake will be developed for residental use.

湖周边的土地将会开发成住宅。

ling n.肿胀,增大

例句：This pearl powder will keep the swelling down.

这种珍珠粉会消肿。

om teeth are normally the last teeth to appear in the mouth.

不定式做后置定语

不定式在句中做定语通常做后置定语，即放在被修饰名词或代词后。它通常有以下几种用法：

(一)不定式常可用来修饰物，表示要做某事。

如： next train to arrive was from NewYork.下一列到站的火车是从纽约开来的。

2.I have nothing to say on this question.在这个问题上，我没有什么话要说。

3. We are looking for somewhere to live.我们正在找一个地方住。

(二)不定式还可用来修饰人。

如： was the first guest to arrive.他是第一个到达的客人。

Brown was the next person to rise to speak.布朗小姐是下一个起来发言的人。

was a brave man to do what he did.他是个勇者才有这样的行为。

(三)很多特定的名词后也可用不定式做定语，这样的名词常用的有：way，time，reason，chance，opportunity，need，wish，effort，right，ambition等。

如：'s time for you to get up and go to school.你该起床去上学了。

e is no reason to doubt his word.没有理由怀疑他的话。

have now an opportunity to go abroad to study further.他们现在有机会出国深造。

(四)某些动词或形容词后可接不定式时，它相应的同根名词也常用不定式做定语。

如： made an attempt to learn English well.他试图学好英语。(attempt to do sth)

ability to get on with people is his chief advantage.他能和人相处是他的主要优势。(be able to do sth)

3.I don't trust his promise to come for a visit.我不相信他来访的诺言。(promise to do sth)

anxiety to succeed led her to work hard.她迫切想成功，这促使她努力工作。(be anxious to do sth)

rts say people should have their mouths examined between the ages of sixteen and twenty for placement of their wisdom teeth.

“have sth. （宾语） 过去分词（宾语补足语）”意为“让/叫/使/请别人做某事”。宾语sth.后面用过去分词作宾语补足语，说明sth.与过去分词表示的动作之间是被动关系。例如：

We had the machine mended just now.

我们刚才请人把机器修好了。

He has had his hair cut.

他（请人给他）理发了。

The patient is going to have his temperature taken.

这个病人准备请/叫/让人量体温。

American Dental Association says removal is generally advised when wisdom teeth only partly break through the gums.

break through突破,冲破;战胜,克服

例句：Demonstrators tried to break through the police cordon.

群众企图突破警察的封锁线。

may depend on the condition of the wisdom teeth and the number to be removed.

depend on依赖,依靠;取决于,随…而定

例句：They depend on a particular historical situation.

它们取决于特定的历史境况。