深度   常速英语

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Thousands of ancient temples dot the landscape of this valley in Myanmar, also known as Burma. The temples of Bagan have stood since the 11th century, but they're in an earthquake zone and in dang...

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So I'm Mike Lemonick. And I'm Lee Billings. And we're going to talk about dark matter. Just a few weeks ago, Vera Rubin, a very eminent astronomer, died. And many people think she should have got...