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What is a black hole? Well, it's difficult to answer this question, since the terms we would normally use to describe a scientific phenomenon are inadequate here. Astronomers and scientists think that a black hole is a region of space (not a thing) i
新gre作文写作考察考生完成题目过程中是否能够融合批判性思维和分析写作能力,以下是gre考试写作部分issue的优秀写作实例,通过这些优秀范文或是习作,考生可以借鉴里面的短语、句子或思
Despite Paralysis, Hawking's Mind Soars When he turned 70 in 2012, Hawking was honored with a special exhibit at Londons Science Museum. The tribute gave visitors an inside look at the life and work of one of the world's greatest minds. We have some
JUDY WOODRUFF: But, first, this week marks the 100th anniversary of the publication of Albert Einstein's greatest work, a series of papers laying out the general theory of relativity. Gwen has a look at how it changed our understanding of the cosmos
【原文】 Black HolesWhat is a black hole? Well, it's difficult to answer this question, since the terms we would normally use to describe a scientific phenomenon are inadequate here. Astronomers and scientists think that a black hole is a region