单词：curvature of a conic
二次曲线的曲率
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还记得孙燕姿那首红遍大江南北的《绿光》吗？翻越过前面山顶、层层白云，绿光在哪里？不知道有多少人跟小编一样，以为歌里的绿光只是对幸福的比喻。而其实在现实中，绿光是真实存在
发表于:2019-01-28 / 阅读(189) / 评论(0)
实用英语
实用英语
The analogy that is usually given for explaining the curvature of space is to try to imagine someone from a universe of flat surfaces, who had never seen a sphere, being brought to Earth. No matter how far he roamed across the planet's surface, he wo
发表于:2019-01-29 / 阅读(183) / 评论(0)
万物简史
万物简史
One of South Korea's most powerful business leaders has avoided a prison sentence for alleged corruption. A South Korean court agrees the former chairman of Samsung evaded taxes, but it threw out more serious charges. VOA's Kurt Achin reports from S
发表于:2019-02-02 / 阅读(157) / 评论(0)
VOA标准英语2008年（七月）
VOA标准英语2008年（七月）