Unit 1

spaceship
宇宙飞船
moon
月亮,月球
astronaut
宇航员
have / has ( had )
有
dream
梦
last night
昨夜
am / is ( was )
是
are ( were )
是
air
空气
friendly
友好的
Earth
地球
yesterday
昨天
swimming pool
游泳池