Words
1. 行星 n. _______
3. 快的，迅速的 adj. _______
5. 乘客 n. _______
7. 味道好的 adj. _______
9. 比较 v. _______
11. 围绕；将……圈起来 v. _______
13. 可能性 n. _______
15. 外来者，陌生人 n. _______
17. 电子的 adj. _______
*19. 头盔 n. _______
*21. 拥挤的 adj. _______
*23. 行星间的 adj. _______
*25. 挑战性的 adj. _______
*27. 距离；远处 n. _______
*29. 百分率；百分数 n. _______
*31.(复)商品，货品 n. _______
2. 被污染的 adj. _______
4. 增加 n. _______
6. 使人不舒服的;不舒适的 adj. _______
8. 专门地，特地 adv. _______
10. 快地，迅速地 adv. _______
12. 一致，同意 n. _______
14. 疑惑，疑问 n. _______
16. 风险，危险 n. _______
*18. 火星 n. _______
*20. 重力 n. _______
*22. 氧气 n. _______
*24. 网络 n. _______
*26. 知道，意识到 adj. _______
*28. 外星人 n. _______
*30. 劣势，不利条件 n. _______
*32. 娱乐 n. _______

1. planet
3. fast
5. passenger
7. tasty
9. compare
11. circle
13. possibility
15. stranger
17. electronic
19. helmet
21. crowded
23. interplanetary
25. challenging
27. distance
29. percentage
31. goods
2. polluted
4. increase
6. uncomfortable
8. specially
10. quickly
12. agreement
14. doubt
16. risk
18. Mars
20. gravity
22. oxygen
24. network
26. aware
28. alien
30. disadvantage
32. entertainment

Phrases
1. 再；重新
2. 干粮
3. 睡袋
4. 以……的速度/高速地
5. 以……的形式
6. 与……相比
7. 开展；执行
8. 毕竟
9. 到太空旅行
10. 到2100年为止
11. 大量的乘客
12. 人口的快速增长
13. 被特别设计
14. 对……有很大帮助
15. 阻止自己漂浮进入太空
16. 关于做某事的指南
17. 一种很受欢迎的……形式
18. 以讨论开始
19. 为住那里而担心
20. 公共交通系统
21. 一致同意
22. 不仅有趣，还很有挑战性
23. 越来越拥挤
24. 随着技术的发展
25. 污染越来越严重
26. 知道……
27. 重力的八分之三
28. 连上网络的电脑
*29. 氧气罐
*30. 电源包

1. (all) over again
2. dried food
3. sleeping bag
4. at the/a speed of .../at high speed
5. in the form of ...
6. compare with/to ...
7. carry out
8. after all
9. travel into space
10. by the year 2100
11. large numbers of/a large number of passengers
12. the rapid increase in population
13. be specially designed
14. be of great help to ...
15. prevent oneself (from) floating off into space
16. a guide to doing sth ...
17. a very popular form of ...
18. begin/start with a discussion
19. worry about/be worried about living there
20. the public transport system
21. be in agreement
22. challenging as well as interesting
23. more and more crowded
24. with the development of technology
25. more and more polluted
26. be aware that/of ...
27. three-eighths/three eighths of the gravity
*29. air tank
*30. power pack

翻译:
1. again
2. dry food
3. sleeping bag
4. at a speed of... / at high speed
5. in the form of...
6. compare with...
7. carry out
8. after all
9. travel to space
10. by the year 2100
11. a large number of passengers
12. the rapid growth of population
13. be specially designed
14. be of great help to...
15. prevent oneself from floating into space
16. a guide on how to do sth.
17. a very popular form of...
18. start with a discussion
19. worry about living there
20. public transport system
21. agree on
22. not only interesting but also challenging
23. more and more crowded
24. with the development of technology
25. pollution is getting more and more serious
26. know about...
27. three - eighths of the gravity
28. computers connected to the Internet
29. oxygen tank
30. power pack