美联英语提供：英语阅读：黑洞两分钟做个小测试，看看你的英语水平黑洞What is a black hole? Well, its 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) into which matter has fallen and from which nothing can escape - not even light. So we cant see a black hole. A black hole exerts a strong gravitational p
