FlexiLingo
👉 Head to https://brilliant.org/spacetime/ for a 30-day free trial + 20% off your annual subscription Check out the Space Time Merch Store https://www.pbsspacetime.com/shop Here’s the story we like to tell about the beginning of the universe. Space is expanding evenly everywhere, but if you rewind that expansion you find that all of space was once compacted in an infinitesimal point of infinite density—the singularity at the beginning of time. The expansion of the universe from this point is called the Big Bang. We like to tell this story because it's the correct conclusion from the des...
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B1 · 中级
能听懂简单新闻就可以
- 81% 的单词在 B1 或更简单的水平。
- 每分钟 113 词：语速慢，清晰。
- 整集共有 94 个较难的单词（B2 及以上）。
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Thank you to Brilliant for supporting PBS.
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But since then we've learned so much more.
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本集中 8 个较难的单词。点一个查看释义，然后标记一下。
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这一集适合你吗？
B1 · 中级
能听懂简单新闻就可以
- 81% 的单词在 B1 或更简单的水平。
- 每分钟 113 词：语速慢，清晰。
- 整集共有 94 个较难的单词（B2 及以上）。
文字稿
本集开头部分。完整文字稿在播放器中。
较难的单词（B2+）
Thank you to Brilliant for supporting PBS. universe that followed Einstein's general theory of relativity back in the 19-teens. But since then we've learned so much more. Does our modern understanding of the universe still insist on a point like Big Bang?
Recent work actually gives us a way to avoid the beginning of time. The key to understanding whether the universe had a beginning is to decide whether their There exists what we call a past singularity, whether all points in space were at the same point at time t equals zero.
And from the earliest models of the expanding universe, the answer seemed yes. When people like Alexander Friedman and George Lemartre solved the equations of Einstein's general relativity back in the 19-teens and 20s, they found that if you rewind the expansion, Then indeed, all points converged on one point at the start of time.
以上是开头部分。 本集其余部分（22 分钟）在播放器中：每个单词都可点击，附翻译、生词收藏和单词卡。
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