单词：steinhoff
[人名] 斯坦霍夫
单词：steinhoff 相关文章
Black holes got their name because light can't escape them, beyond a certain radiusthe event horizon. But in 1974 Stephen Hawking proposed that quantum effects at the event horizon might cause black holes to benot completely black. Hawking said that
发表于:2018-12-24 / 阅读(475) / 评论(0)
2016年Scientific American(八)月
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Mom's Flu Vaccination Boosts Baby Birth Weight Pregnant women who get vaccinated against influenza are less likely to have low birth weight babies, according to a study conducted in Bangladesh. In this study, 340 pregnant women were randomly assigned
发表于:2019-01-14 / 阅读(438) / 评论(0)
VOA标准英语2012年(二月)
VOA标准英语2012年(二月)