PU4 U8 Cross-curricular: Preparing for Mars
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01
planet
行星
Mars is the fourth planet from the sun.
02
surface
表面
The surface of Mars is red and rocky.
03
atmosphere
大气层
The atmosphere on Mars is very thin.
04
astronaut
宇航员
Astronauts wear a spacesuit in space.
05
robot
机器人
A robot can work on Mars for years.
06
liquid water
液态水
Scientists found liquid water on Mars long ago.
07
iron oxide
氧化铁（铁锈）
Iron oxide makes the rocks look red.
08
moon landing
登月
The first moon landing was in 1969.
09
spacewalk
太空行走
The astronaut did a spacewalk outside the station.
10
dome
穹顶舱
Six scientists lived in a dome for eight months.
11
survive
生存
Plants cannot survive without water.
12
contact
联系
They were out of contact with their families.
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