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人类进入21世纪,上太空揽月,下五洋探险已成为现实。物质的日益丰富,经济的高度发展,使人类社会享
As humankind enters the 21st century, it is a reality that the exploration of space under the moon and the exploration of the Five Oceans will become reality. The material is increasingly rich, the economy is highly developed, so that human society enjoy