1. think ofas把看作
3. combine into合成
4. move around the sun环绕太阳运转
5. become violent变得激烈
6. the solid surface固体表面
7. explode loudly猛烈爆炸
8. in time及时，最终
9. produce the water vapor产生水蒸汽
10. make the earths atmosphere构成了地球的大气层
11.cool down冷却
12. on the surface在表面
13. be different from与不同
14.go round the sun环绕太阳运转
15. disappear from从消失
16. stay on存留在
17. show ones quality显现某人的特性,
18.dissolve harmful gases分解，溶解有害气体,
19. become part of变成的一部分,
20. develop life发展生命,
21.grow in the water在水里生长,
22. encourage the development of鼓励的发展,
23 millions of years later几万年以后,
24.live on land在陆地上生活,
25. live in the sea在海里生存,
26. grow into forests长成森林,
27. produce young生出幼仔,
28. lay eggs下蛋,
30.spread all over the earth遍布全世界,
31.develop new methods发展了新的方法,
32.. move around迁徙,
33. go by过去，推移,
34.preventfrom防止做,
35.escape from into从逃离到,
36.depend on.依靠，依赖，取决与,
37. solve a problem解决
38 be lucky enough足够幸运,
39. make a trip去旅行,
40. visit the moon参观月球,
41. in the spaceship在太空飞船中,
42. explain to that向解释,
43. on the journey在旅程中,
44 be off启程,
45 rise into the air升人太空,
46. feel the pull of the earth感觉到地球的拉力,
48. pushinto the seat把推向座位
51.fall from a tree从树上掉下来,
52. fall to the ground朝地上落下去,
53. get close to接近,
54 cheer up高兴起来,
55 float weightlessly around失重飘来飘去,
56 in the spaceship cabin太空船舱,
57. watchdo看着做,
58. move freely自由的活动,
59. climb down the steps从梯级上爬下来,
60. step forward向前迈步,
61.fall over摔倒,
62. need practice需要练习
63..get the hang of掌握了的诀窍,
64. enjoy oneself感到自如,
65. leave the moon s gravity摆脱月球引力
66. come back to回到