普通高中课程标准实验教科书 英语必修3 Unit 4 Astronomy: the s

 Last month I was lucky enough to have a chance to make a trip into space with my friend Li Yanping, an astronomer¹. We visited the moon in our spaceship!
      Before we left, Li Yanping explained to me that the force of gravity² would change three times on our journey and that the first change would be the most powerful³. 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 earth's gravity. It was so hard that we could not say anything to each other. Gradually⁴ the weight lessened⁵ and I was able to talk to him. "Why is the spaceship not falling back to the earth? On the earth if I fall from a tree I will fall to the ground." I asked. "We are too far from the earth now to feel its pull," he explained, "so we feel as if there is no gravity at all. When we get closer to the moon, we shall feel its gravity pulling us, but it will not be as strong a pull as the earth's." I cheered up immediately and floated weightlessly around in our spaceship cabin⁶ watching the earth become smaller and the moon larger.
      When we got there, I wanted to explore immediately. "Come on," I said. "If you are right, my mass will be less than on the earth because the moon is smaller and I will be able to move more freely⁷. I might even grow taller if I stay here long enough. I shall certainly weigh less!" I laughed 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. "Oh dear," I cried, "walking does need a bit of practice now that gravity has changed." After a while I got the hang of it and we began to enjoy ourselves.
      Leaving the moon's gravity was not as painful as leaving the earth's. But returning to the earth was very frightening. We watched, amazed⁸ as fire broke out on the outside of the spaceship as the earth's gravity increased. Again we were pushed hard into our seats as we came back to land. "That was very exhausting⁹ but very exciting too," I said. "Now I know much more about gravity! Do you think we could visit some stars next time?" "Of course," he smiled, "which star would you like to go to?"

1 astronomer   

n.天文学家

参考例句：

• A new star attracted the notice of the astronomer.新发现的一颗星引起了那位天文学家的注意。
• He is reputed to have been a good astronomer.他以一个优秀的天文学者闻名于世。

2 gravity   

n.重力，引力，地心引力

参考例句：

• An apple falls down because of gravity.由于重力的关系，苹果往下掉。
• The stone rolled down the mountain by gravity.这块石头由于重力作用而滚下山。

3 powerful   

adj.有力的，有权力的，强大的

参考例句：

• The UN began to get more and more powerful.联合国开始变得越来越强大了。
• Such are the most powerful voices of our times!这些就是我们时代的最有力的声音！

4 gradually   

adv.逐渐地

参考例句：

• The roaring sea gradually calmed down.咆哮的大海逐渐平静下来。
• Gradually he became silent.渐渐地他变得沉默寡言了。

5 lessened   

减少的，减弱的

参考例句：

• Listening to the speech through an interpreter lessened its impact somewhat. 演讲辞通过翻译的嘴说出来，多少削弱了演讲的力量。
• The flight to suburbia lessened the number of middle-class families living within the city. 随着迁往郊外的风行，住在城内的中产家庭减少了。

6 cabin   

n.(结构简单的)小木屋；船舱，机舱

参考例句：

• They threw up a new cabin in a couple of hours.在几小时之内他们就建起了一座新的小屋。
• It's very hot in the cabin;let's go on deck.舱室内很热，我们到甲板上去吧。

7 freely   

adv.自由地，随便地，无拘无束地

参考例句：

• She was unable to keep back her tears,and wept freely.她抑制不住泪水，痛痛快快地哭了起来。
• A liquid flows freely and has no fixed shape.液体能自由流动，无固定形态。

8 amazed   

adj.吃惊的，惊奇的v.使大为吃惊，使惊奇( amaze的过去式和过去分词 )

参考例句：

• Just the size of the place amazed her. 仅仅地方之大就使她十分惊奇。
• I was amazed at her knowledge of French literature. 她的法国文学知识之丰富使我大为惊奇。

9 exhausting   

a.疲倦的

参考例句：

• an exhausting day at work 工作得筋疲力尽的一天
• This exhausting work is enough to run everyone down. 这项费力的工作足以使人精疲力竭。