英國學生科學讀本 Lesson 97 人體(3)

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第97課 人體

If you wish to keep your body healthy, you must learn something about its inside as well as about its outside.

你想要有一個健康的身體, 那就不僅需要了解它的外部結(jié)構(gòu), 更要明白它的內(nèi)在構(gòu)造。

The trunk or middle part of your body is hollow, and inside it there are several parts or organs,

人體的軀干屬于中空結(jié)構(gòu), 里面長有很多器官,

each of which has its own work to do in helping you to live a healthy and happy life.

它們各有各的功能, 可以幫助你享受一個健康、快樂的人生。

The upper part of your trunk is called the chest.

軀干的上方就是胸腔。

Place your hand near the middle of your chest, and notice whether anything is moving inside it.

把手放在胸腔中部, 注意是否能夠感覺到里面有東西在跳動。

Yes; that is your heart beating.

那就是你的心跳。

The heart is a strong hollow bag about the size of your closed hand. It is made of flesh or muscle.

心臟的大小跟你緊握的拳頭差不多, 這是一個結(jié)實的中空袋狀結(jié)構(gòu), 由肌肉組成。

The heart is filled with blood from the veins every second.

心臟每時每刻都充滿了來自血管的血液。

No sooner is it full than it contracts or closes, and so squeezes the blood into pipes or blood-vessels, called arteries,

當它還沒有飽滿的時候就會收縮或者關(guān)閉, 從而將血液擠壓到名為動脈的血管之中,

which carry the blood to every part of your body.

這樣一來, 血液就會流到身體的各個角落。

Then the blood comes back to the heart again through other pipes or tubes, which are called veins.

隨后, 這些血液通過靜脈血管流回到心臟之中。

You can easily see some veins under the skin on the back of your hand.

只要看看自己手背的皮膚, 你就能發(fā)現(xiàn)一些靜脈。

Because the blood moves round and round inside our body, starting from the heart and coming back to the heart again, it is said to circulate.

因為血液總是在身體內(nèi)部不停流動——從心臟流出并再次回流到心臟之中——這就構(gòu)成了血液循環(huán)。

For this reason the heart, the arteries, and the veins are called the organs of circulation.

為此, 心臟、動脈與靜脈就被稱作循環(huán)器官。

In the chest we also find two organs called the lungs, one on each side of the heart.

在胸腔中, 我們還會看到兩個名叫肺的器官, 它們分別位于心臟兩側(cè)。

These lungs contain many little tubes which are full of air, and many other tubes which contain blood.

肺上長有很多充滿了空氣與血液的管狀結(jié)構(gòu)。

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