在PTE中,无论是Summarise Spoken Text 还是 Re-tell Lecture的考题大都是从真实的讲座或者演讲中截取的,中间经常经常夹杂很多不同的环境音.很多同学都反映有时未必是听不懂,而是听不到. 鉴于此,墨尔本文波雅思PTE专门为大家总结了真实讲座的PTE练习音频,相比新闻音频来说,整体更加接近PTE考试的真题,内容方面,我们也会为大家提供考试中存在的近似题,最近我们会持续更新,敬请期待!
Because black holes are black, we don’t see them directly and that’s what makes it challenge to find them, but we believe we have seen them indirectly by the way they influence their environment, so for instance in the center of our galaxy, we believe there is a very massive black hole one that weighs maybe three million times as much as the Sun. The way we believe it’s there, the evidence that we’ve gathered is that we can watch stars in orbit around the center of our galaxy and they are whipping around so quickly that the only object that we can theorise, that would have the capacity to impart that fantastic velocity to these stars would be an object that would have the gravitational pull of black hole. Therefore, we believe that there is a black hole in the center of our galaxy.