英语必修三Unit 4 Astronomy课文翻译
广元人事网-堂吉诃德简介
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英语必修三Unit 4
Astronomy课文翻译
作者：未知 来源：尚学苑 2014-09-20
LIF HOW E BEGAN ON THE EARTH
No one knows exactly how the earth began, as
it happened so long ago. However, according
to
a widely accepted theory, the universe began with
a Bangthat threw matter in all
that, atoms
began to form and combine to create stars and
other bodies.
For several billion
years after the
was to become was uncertain
until between 4.5 and 3.8 billion years ago when
the dust settled into
a solid globe. The earth
became so violent that it was not clear whether
the shape would last or not.
It exploded
loudly with fire and rock. They were in time to
produce carbon, nitrogen, water vapour
and
other gases, which were to make the earths
atmosphere. What is even more important is that
as the earth cooled down, water began to
appear on its surface.
Water had also
appeared on other planets like Mars but, unlike
the earth, it had disappeared
later. It was
not immediately obvious that water was to be
fundamental to the development of life.
What
many scientists believe is that the continued
presence of water allowed the earth to dissolve
harmful gases and acids into the oceans and
seas. This produced a chain reaction, which made
it
possible for life to develop.
Many millions of years later, the first extremely
small plants began to appear on the surface
of
the water. They multiplied and filled the oceans
and seas with oxygen, which encouraged the
later development of early shellfish and all
sorts of fish. Next, green plants began to grow on
land.
They were followed in time by land
animals. Some were insects. Others, called
amphibians, were
able to live on land as well
as in the water. Later when the plants grew into
forests, reptiles
appeared for the first time.
They produced young enerally by laying eggs. After
that, some huge
animals, called dinosaurs,
developed. They laid eggs too and existed on the
earth for more than
140 million years.
However,
65 million years ago the age
of the dinosaurs ended. Why they suddenly
disappeared still
remains a mystery. This
disappearance made possible the rise of mammals on
the earth. These
animals were different from
all life forms in the past, because they gave
birth to young baby
animals and produced milk
to feed them.
Finally about 2.6
million years ago some small clever animals, now
with hands and feet,
appeared and spread all
over the earth. Thus they have, in their turn,
become the most important
animals on the
planet. But they are not looking after the earth
very well. They are putting too
much carbon
dioxide into the atmosphere, which prevents heat
from escaping from the earth into
space. As a
result of this, many scientists believe the earth
may become too hot to live on. So
whether life
will continue on the earth for millions of years
to come will depend on whether this
problem
can be solved.
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地球上生命的起源
没有人确切知道地球是怎么样开始形成的，因为在很早很在以前地球就形成了。然而，
一种普遍为人们所接受的理论是：宇宙起源于一次大爆炸，这次大爆炸将物质投射到四面八
方。
然后，原子开始形成并结合成恒星和其他天体。
大爆炸后好几十亿年过去了，但地球还只是一团尘埃。随后它会变成什么没人能知道，
直到38-45
亿年前，这团尘埃才慢慢地形成一个团体的球状物。地球开始变得激烈动荡，
不知道这个固体形状是否会
继续存下去。它猛烈地爆炸喷出了烈火与岩石，最终产生了碳，
氮气，水蒸气和其他多种气体，从而形成
了地球的大气层。更为重要的是，地球冷却了下来，
地球的表面就开始出现了水。
在火星这些其他行星上都出现了水，但和地球不同的是，这些水后来都消失了。水对于
生命
的发展会起关键作用，这一点在当时并不明显。很多科学家相信，由于地球上长期有水
存在，使得地球得
以把有害气体和酸性物质溶解在海洋里。这就产生了一系列的反应，使得
生命就有可能开始发展了。
好几百万年后，水的表面开始出现了极小的植物。他们繁殖起来就使得早期的海洋充满
了氧气，这为早期的贝类及其他各种鱼类的发育进一步创造了条件。接着，绿色植物开始出
现在
陆地上。随后，陆地上出现了动物，其中有一些是昆虫，另外一些叫两栖动物，他们既
能在陆地上生活，
也能在海里生存。后来，当植物长大成了森林的时候，爬行动物出现了。
他们一般是通过孵蛋而繁衍后代
的。再后来一些叫做恐龙的巨型动物出现了。他们也生蛋，
在地球上生存了一亿四千多万年。然而，六千
五百万年前，恐龙时代结束了。他们为什么会
突然灭绝至今仍是个谜。恐龙的灭绝使地球上哺乳动物的产
生有了可能。这些动物不同于以
往所有的生物形式，因为他们能从体内生产出幼崽并给幼崽哺乳。
最后，大约260万年前，一些小巧聪明，长着手脚的动物出现了，他们散布在地球的
各
个地方。于是，他们接着成为这个行星上最重要的动物。然而，他们对地球却不怎么在意，
他
们把过多的二氧化氮释放到大气层中，这使得地球上的热不能释放到太空中去。地球可能
因此变得太热而
不适合生物生存。所以，在未来数百万年中，生命能否在地球上延续，取决
于这个问题能否得到解决。
A VISIT TO THE MOON
Last month I was lucky enough to have a chance to
make a trip into space with my friend Li
Yanping, an astronomer. We visited the moon in
our spaceship! Before we left, Li Yanping
explained to me that the force of gravity
would change three times on our journey and that
the first
change would be the most powerful.
Then we were off. As the rocket rose into the air,
we were
pushed back into our seats because we
were trying to escape the pull of the earths
gravity. It was
so hard that we could not say
anything to each other. Gradually the weight
lessened and I was able
to talk to him.
I
will fall to the ground.
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pulling us,
but it will not be as strong a pull as the
earths.
weightlessly around in our spaceship
cabin watching the earth become smaller and the
moon
larger.
When we got
there, I wanted to explore immediately.
mass
will be less than on the earth because the moon is
smaller and I will be able to move more
freely. I might even grow taller if I stay
here long enough. I shall certainly weigh
less!
and climbed down the steps from the
spaceship. But when I tried to step forward, I
found I was
carried twice as far as on the
earth and fell over.
practice now that gravity
has changed.
ourselves.
Leaving the moons gravity was not as painful as
leaving the earths. But returning to the earth
was very frightening. We watched, amazed as
fire broke out on the outside of the spaceship as
the
earths gravity increased. Again we were
pushed hard into our seats as we came back to
land.
was very exhausting but very exciting
too,
you think we could visit some stars next
time?
like to go to?
月球之旅
我的朋友李彦平是一位宇航员。上个月我有幸得到一个机会同他一起去太空旅行。我们
乘宇
宙飞船参观了月球。
在启程以前,李彦平向我解释说,在我们
的航行中会有三次引力的改变,而第一次的改变
将是最强的。随后我们就启航了。随着火箭徐徐升空,我
们慢慢逃离地球的引力。但这种引
力太强了,把我们重重地向 后推在座位上,以至于我们彼此间都不能
说话了。随后,这个力量
匮慢减小,我才能够同他讲话。我问道: 为什么太空船不会向后朝地球的方向
落下去呢?在地
球上的时候,如果我从树上掉下来,总会朝地上落下去的。李彦平解释说现在我们离地球
太
远了,感觉不到地球的拉力,所以我们好像一点儿也感觉不到地球引力了。当我们更接近月球
时,就会感到月球的引力在拉我们。但是,月球的引力不像地球的引力
那么大。我立刻感到
很高兴,由于失重我在太空舱里飘来飘去,我望着(身后的)地球越来越小,而(前
方的)月球越
来越大。
我们到达月球时,我就想立即进行探测。来吧,我说,要是你讲得对,我的重量就会比在
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地球上小,因为月亮比地球小,
而我就能更自由地活动了。如果我在月球上呆的时间足够长的
话,我甚至可能长得更高,我的体重肯定也
会变得更轻! 我笑着从火箭的梯级上爬下来。而当
我试着向前迈步的时候,我发觉我被送出去很远,步
子的跨度竟是在地球上的两倍,因而我摔
倒了。天哪,我大声说,重力改变了,看来走路也的确需要练一
练了。过了一会儿,我才掌握
了走路的诀窍,这才开始感到自如了。
摆脱月
球引力不像摆脱地球引力那样痛苦。但是返回到地球的经历却是非常吓人的。我
们惊奇地看着,随着地球
引力的增加,宇宙飞船的外层燃烧起火。当我们回到地面时,我们又感
到被重重地推倒在座位上。我说道
真是精疲力竭了,但也很激动人心。关于引力,我现在就懂
得更多了。你认为下次我们可以上星球上去参
观吗? 当然可以,他笑着说,你想到哪颗星
球上去呢?
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