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planets 行星
水星
地球
火星
土星
海王星
金星
木星
天王星
冥王星
How can we go to outer space?
By spacecraft.
astronaut
space station
Has man discovered life on the moon?
[d?'sk?v?] v. 发现；发觉
Mars is considered to be the planet that could be suitable for people to stay.
Good news: Some scientists have already sent a spacecraft to Mars.
Has man discovered life on Mars?
Listen and number the words as you hear them.
earthlandmessage
moonnewsplanet
reachscientist
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