1. 你觉得。。。怎么样？                                                                     

2. 呈药丸形状                                                                     

3. 火星和太阳之间的距离                                                               

4. 目前，现在                                                                   

5.到2100年时                                                                  

6. 变得愈来愈拥挤                                                               

7. 大量的                                                                        

8. 大量的乘客                                                                    

9.t以光的速度旅行                                                               

10. 地球引力的八分之三                                                               

11. …可以指望                                                                     

12. 再；重新                                                                     

13. 把A和B相比                                                               

14. 被与某物相比                                                                

15. 在许多方面                                                                  

16. 把A连接B                                                                   

17. 连接到星际网络                                                               

18在某些方面                                                                    

19. 住在火星上的可能性                                                               

20.不但……而且；既……又                                                               

21. 防止某人做某事                                                                

22. 因为人口的快速增长                                                               

23. 迅速地增加                                                                     

24. 三分之一                                                                   

25.  知道                                                                         

27. 中国的人口是多少？                                                                                   

28. 绕太阳运转                                                                 

29. 意见一致                                                                    

30.  与……相似                                                                 

31. 开展一个调查                                                                        

32. 毕竟                                                                           

33. 住在火星上的优势                                                               

34. 因为住在那里生病                                                               

35. 以讨论开始                                                                  

36. 听说                                                                        

37. 摇滚乐                                                                       

38. 在西方                                                                       

39. 太空旅行                                                                     

40. 开始对„„感兴趣                                                               

41. 开始某人的第一次飞行                                                                

42. 在某人的业余时间里                                                               

43. 参加海军                                                                      

44. 一次飞行试验