职称考试--第四讲：Rockets in the Sky(高)
|Rockets in the Sky
If someone asked you, “what color is the sky?” I expect that you would
answer, “Blue.” I am afraid that you would be wrong. The sky has no color.
When we see blue, we are looking at blue sunlight. The sunlight is shining
on little bits of dust in the air.
We know that there is air all around the world. We could not breathe without
air. Airplanes could not fly without air. They need air to lift their wings.
Airplanes cannot fly very high because as they go higher the air gets thinner.
If we go far enough away from the earth, we find there is no air.
What is the sky? The sky is space. In this space there is nothing except
the sun, the moon and all the stars.
Scientists have always wanted to know more about the other worlds in the
space. They have looked at them though telescopes and in this way they
have found out a great deal.
The moon is about 384,000 kilometers away form the earth. An airplane cannot
fly to the noon because the air reaches only 240 kilometers. Then there
is no air. But there is something that can fly even when there is no air.
This is rocket.
I am sure that your are asking, “How does a rocket fly?”If you want to
know, get a balloon and then blow it up until it is quite big. Do not tie
up the neck of the balloon. Let go! The balloon will fly off through the
air very quickly. The air inside the balloon tries to get out. It rushes
out through the neck of the balloon and this pushes the balloon through
the air. It does not need wings like an airplane.
This is how a rocket works. It is not made of rubber like a balloon, of
course. It is made of metal. The metal must not be heavy but it must be
very strong. There is gas inside the rocket which is made very hot. When
it rushes out of the end of the rocket, the rocket is pushed up into the
Rockets can fly far out into space. Rockets with men inside them have already
reached the moon. Several rockets, without men inside them, have been sent
to other worlds much farther away. One day rockets may be able to go anywhere
in the space.
1．little bits of dust 少许尘埃
2．all around/all round （在……）周围，各处。如：From all around we heard
the laughter of children.我们到处都听见了孩子们的笑声。
3．We could not breathe without air. Airplanes could not fly without air.这是两个双重否定句，起到加强语气的作用。
4．…as they go higher, the air gets thinner随着它们向更高处飞去时，空气也就变得越稀薄。
5．far enough 足够远。Enough修饰形容词时，它的位置在形容词词的后面。如：Wewere
fortunate enough to get an empty car.
6．through telescopes 通过望远镜。Through 还常指从头到尾经过。
7．in this way 以这种方式。in a way 是“在某种程序上”的意思，如：In a
way you are right. In the way 是“挡道”的意思。如：The chair is in the
way; move it please.
8．a great deal/a good deal 大量的（跟不可数名词）。如：She seems to have
a great deal of money.
9．get a balloon and then blow it up until it is quite big. 拿一个气球，然后把它吹到相当大。
10．fly off 飞离
11．be made of 和be made from都是“由……制成”的意思。如果制成的东西还看得出是什么原料做的，就用of，如果已看不出是用什么原料做的，则应用from。
试比较：We make tables of wood. We make paper from rags.
12．rush out of 从……冲出
13．other worlds 在此是指宇宙中的其它星球。
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