According to the astronauts who were lucky enough to fly into space, when they were roaming in the sky, they looked at the earth from afar, and what caught their eyes was a crystal ball with blue and white stripes interlaced with each other, and a thin water-blue "gauze" was wrapped outside. The earth, the mother of mankind, the cradle of life, is so beautiful, spectacular and amiable. However, the earth is a planet with a radius of only over 6,300 kilometers. In the starry universe, it is like a boat.
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