科学研究   慢速英语

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On a cold October day in nineteen fifty-seven, the Soviet Union launched a small satellite into orbit around the Earth.Radio Moscow made the announcement."The first artificial Earth satellite in the w...

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Today we tell about an appeal for genetic material from a famous creature that may not even exist.We report on the health of a manwho lived five thousand years ago.And we tell about the effect of chan...

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Paul Doherty is a writer from the United States. He describes a memory for us. “I, my friend Martin, and a small group were climbing in the mountains. We climbed with two ropes. Martin and I climbe...