PU4 U8 Culture: Life on the ISS
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01
gravity
重力
There is no gravity on a space station.
02
float
漂浮
Everything floats when there is no gravity.
03
space station
空间站
Astronauts live and work on a space station.
04
astronaut
宇航员
Astronauts come from many different countries.
05
laboratory
实验室
The ISS is a huge science laboratory in space.
06
keep fit
保持健康
Moving against gravity helps us keep fit.
07
weak
虚弱的
If astronauts don't exercise, they become weak.
08
return
返回
They have health problems when they return to Earth.
09
waste
垃圾；废物
Space travel creates a lot of waste.
10
pollution
污染
Space travel also creates pollution.
11
sustainable
可持续的
Space travel will be cleaner and more sustainable.
12
environment
环境
We must travel without harming the environment.
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