Dental Problems

牙齒的問題

A dental cavity is a hole in the tooth.牙洞是牙齒上的一個(gè)洞。

A cavity is caused by bacteria in the mouth.口腔是由口腔中的細(xì)菌引起的。

Brushing your?teethfrequently and regularly?canhelp?preventcavities.頻繁的且有規(guī)律的刷牙有助于預(yù)防蛀牙。

A?crackedtooth can be caused by?biting?down on something?hard.牙齒破裂可能是咬硬東西造成的。

Dentists treat a cracked tooth by covering it with a crown.牙醫(yī)用牙冠覆蓋裂開的牙齒來治療（臨床）。

A dental X-ray is a picture of your teeth and gums.牙齒x光片是你牙齒和牙齦的照片。

An x-ray shows what can't be seen on the surface of the teeth and gums.x光片顯示牙齒和牙齦表面看不到的東西。

Braces are used by dentists to straighten teeth over a period of years.牙套被牙醫(yī)使用矯正牙齒已經(jīng)很多年。

Though braces are usually for children, they can also be used for adults with crooked teeth.雖然牙套通常是給孩子用的，他們（牙套）也可以給牙齒歪的成年人使用。

To extract a tooth, means to remove it from the mouth.拔除牙齒，就是把牙齒從嘴里拔出來

Dentists have to pull hard to extract a tooth.牙醫(yī)必須使勁拔牙

Dentists often inject something into the gum to block the pain during the extraction process.牙醫(yī)經(jīng)常在拔牙的過程中往牙齦里注射一些東西來止痛

Braces are?used on people with?crooked teeth or after an?injury.牙套用于牙齒彎曲或受傷后的人。

The heart pumps blood to all parts of the body through a system of arteries and veins.心臟通過動(dòng)脈和靜脈系統(tǒng)將血液輸送到身體的各個(gè)部位。

It's located in the chest, between the lungs, and beats about once per second.它位于胸腔，在兩肺之間，大約每秒跳動(dòng)一次。

The kidneys remove waste and toxins from the blood.腎臟排出血液中的廢物和毒素。

They are bean shaped organs and are about 10 centimeters long and 6 centimeters wide.它們是豆形的器官（臟器），長約10厘米，寬約6厘米。

The lungs exchange oxygen from the air with carbon dioxide from the blood.肺把空氣中的氧氣和血液中的二氧化碳交換。

They expand when inhaling air, and contract when exhaling air.它們吸入空氣時(shí)膨脹，呼出空氣時(shí)收縮。

The stomach is below the heart, and it's part of the digestive system.胃在心臟下面，它是消化系統(tǒng)的一部分。

It usesacidstodigestfood beforepassingit to the small intestine.在食物進(jìn)入小腸之前，它利用酸來消化食物。

The bladder is a balloon shaped organ that collects urine from the kidneys.膀胱是一個(gè)氣球狀的器官，從腎臟收集尿液。

In an adult, the bladder can hold about half a liter of urine.成年人的膀胱可以容納大約半升的尿液。