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It was a species of Tyrannosaur. 这是暴龙的一种。 That suggested to us, well, maybe these Tyrannosaur teeth are in fact from animals that are trampling the bodies of these things as they eat them. 那就表明，也许这些暴龙牙齿是它们

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These were big but really fast hunters. They were as bad as it got for a while. 这些巨大但速度很快的猎手。有一段时间它们要多坏有多坏。 Albertosaurus would have been a very fearsome predator. 阿尔伯特龙会是非常可怕的

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Over the next 90 million years, a new era called the Cretaceous period dawned. 在接下来的九千万年里，开始了一个叫做白垩纪的新时期。 Broader-leaf plants that could tolerate seasonal weather changes covered the land. 能够忍受

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[00:43.02]Extract 1 [00:45.94]Make questions using the prompts in your book. [01:49.62]Extract 2 [01:52.96]Listen to the questions and answer them for yourself using short answers. [02:00.61]Use the pause button. [03:56.06]Extract 3 Xiaoyan talks to

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今天我们要学的词是hot button。 Hot button, 是热门、焦点。在美国加州进行的最新民意调查发现，支持同性婚姻的选民第一次占据了多数。 The results of the survey showed the highest level of support on the h

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Everybody talks about the weather, but nobody does anything about it, he said. Until now. My invention can change the weather. Just aim it at the sky and push a button. There are buttons for Rain, Sun, and Snow. His wife said, That sounds too good to