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People's desire to explore the spacewas always great.Exploration of the space has always interested people.Scientists tried to explore all the possibilities of getting to Mars.My father is a scientist, and he did many researches on this.A group of researchers took off their whites.He has been doing space research for five years.The spaceship to the Moon has been launched.The company launched a charity project.Ecological problem is one of the most disputed world problems.Searching for a cure for cancer is an important medical problem.Peolle should care more about the nature to solve the pollution problem.