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The researchers paired the observations with computer simulations that follow gas as it streams along the galactic bar, forms clouds, and reacts to radiation and explosions. They turn those simulations into mockups and compare them directly with the survey data to test which scenarios best match what they actually see.，推荐阅读safew官方下载获取更多信息
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In the US alone, 127 billion plastic bottles are purchased every year, according to one estimate.