第二册
Lesson 1-4
Lesson 5-8
Lesson 9-12
Lesson 13-16
Lesson 17-20
Lesson 21-24
Lesson 25-28
Lesson 29-32
Lesson 33-36
Lesson 37-40
Lesson 41-44
Lesson 45-48
Lesson 49-52
Lesson 53-56
Lesson 57-60
Lesson 61-64
Lesson 65-68
Lesson 69-72
Lesson 73-76
Lesson 77-80
Lesson 81-84
Lesson 85-88
Lesson 89-92
Lesson 93-96
telescope
n.望远镜
launch
v.发射
NASA
国家航空和宇宙航行局
billion
n.亿
faulty
a.有错误的
astronaut
n.宇航员
shuttle
n.宇航飞机
Endeavour
n.“奋进”号
robot-arm
n.机器手
grab
v.抓