科学研究   慢速英语

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People infected with the human immunodeficiency virus must take anti-retroviral drugs for the rest of their lives to keep HIV under control.If they fail to do so,HIV-infected cells hidden within the b...

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Tsunami is a two-character Japanese word."Tsu" means "harbor," and "nami" means "wave." So, the Japanese call tsunamis, "harbor waves." Tsunamis happen after an earthquake strikes,either near or under...

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Scientists believe black holes lie at the center of every huge galaxy,including our own Milky Way galaxy.The gravitational power of black holes is so strong that not even light can escape from them.As...

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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...