1, The study of space was mainly carried out by astronomers using telescopes.
2, Humans also want more space to accommodate the world’s increasing population.
3, Yes, they have.
4, Within more than two decades, from the beginning of 1950s to 1970s, the two nations launched many of the milestones.
5, The cooperation in launching the International Space Station is the biggest achievement of the 21st century.
1, I moved to a new town where trees are planted along the street.
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