单词：sigma value
(啤酒)泡沫稳定度，(啤酒)泡沫持久度
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If, as it now seems, every single galaxy has a black hole at its heart, this can't be a coincidence. Perhaps black holes are an essential part of what galaxies are and how they work. No one had expect
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超大质量黑洞
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原汁原味商务英语播客
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