论文部分内容阅读
在浩瀚的宇宙中,我们目前知道唯有太阳系中的地球,蓝天碧海,气象万千,生机勃勃。地球是宇宙的骄子,是各种天缘巧合奇迹汇聚的行星。地球上自46亿年前形成,经过漫长的演化,出现了生命。距今300万年前,地球上出现了人类。最早人类栖息在陆地上,后来为了获取更多的生活资源,逐步开发海洋。但人类更期盼能翱翔天空,遨游宇宙,1957年苏联发射第一个人造地球卫星,1958年
In the vast universe, we now know that only the Earth in the solar system, the blue sky blue sea, the weather, vibrant. The Earth is the pride of the universe, a planet that brings together all kinds of miracles. Earth formed from 4.6 billion years ago, and after a long evolution, life has emerged. Three million years ago, mankind appeared on Earth. The earliest human habitat on land, and later in order to obtain more living resources, and gradually develop the ocean. However, human beings are also looking forward to flying in the sky and traveling the universe. In 1957, the Soviet Union launched its first man-made earth satellite, 1958