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It means that Silk and Ree's theory may be right and if it is also right that supermassive black holes helped trigger star formation, then it must mean that all giant black holes and their galaxies ar

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While many Americans are familiar with black slavery in the South during the 19th Century and its role in igniting the nation's great Civil War, less attention has been paid to the black experience in northern cities such as New York, where so-called

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[00:14.47]What are these? B:Can't you see? They're boxes! [00:36.02]Yes, but what's in the boxes? [01:04.89]Oh! Sweaters. [01:18.45]What colours are they? [01:22.29]B:They're light blue. [01:46.66]blue light blue dark blue [02:22.92]red light red dar

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This is Scientific American's 60-Second Science. I'm Cynthia Graber. This will just take a minute. Most plants capture sunlight. And the results are usually green. Because in photosynthesis, plant chlorophyll uses wavelengths of blue and our sun's ab

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SCIENCE IN THE NEWS - Stephen Hawking and Black Holes / Quantum Theory By Caty Weaver Broadcast: Tuesday, August 17, 2004 VOICE ONE: This is SCIENCE IN THE NEWS, in VOA Special English. I'm Bob Dought

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[00:14.47]What are these? B:Can't you see? They're boxes! [00:36.02]Yes, but what's in the boxes? [01:04.89]Oh! Sweaters. [01:18.45]What colours are they? [01:22.29]B:They're light blue. [01:46.66]blue light blue dark blue [02:22.92]red light red dar

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第243期:快速入睡最好的方法是什么

重点词汇 Wind Down: 放松，松弛 Meditation：冥想 1. Make Your Bedroom Pitch Black 1.卧室漆黑 2. Make Your Bedroom Quiet 2.卧室保持安静 3. Sleep in the Perfect Temperature 3.室内温度适宜睡眠 4. Block Blue Light 4.躲开蓝光