1. A person/animal living in a place
Can be breathed (呼吸)
To move from one place to another
A gas in the air for animals to live
To change or make something
A group of small drops(滴) of liquid(液体) in the air
To make a solid固体 become liquid by adding heat
To keep/continue to hold
Throw (light, heat, sound, etc) back from a surface
Of the North or South Pole

2. To cover something with very tiny(微小) drops of liquid that are sent through the air
The round(圆环) of an object traveling round a planet, star or moon
The force that attracts objects together or pulls things to the ground on earth
Related(与。。。有关) to the Sun
A special clothing for astronauts(宇航员)
A fact; event; action showing sth. to happen
To organize and do
An organized journey with a special purpose

3. Of the planet(行星) Mars
Of something between the planets
To completely change the appearance and character of something, especially to become better

4. transform (彻底)改变
interplanetary 行星间的
Martian 火星的
expedition 远征探险考察
conduct 进行
sign 迹象／征／预兆
gravity 地球引／重力
solar (利用)太阳的
orbit 轨道
polar 极地的
spray 喷(射)
reflect 反射
retain 保持／留
melt 熔化／融化
vapour 蒸汽／蒸气
convert 转变／变换
oxygen 氧气
migrate 迁徙／移居
breathable 可以吸入的
inhabitant 居民／栖居者

5. transform vt.
interplanetary adj.
Martian adj.
expedition noun.
conduct vt.
sign noun.
gravity noun.
solar adj.
orbit noun.
polar adj.
spray vt.
reflect vt.
retain vt.
melt vi.
vapour noun.
convert vt.
oxygen noun.
migrate vi.
breathable adj.
inhabitant noun.