单词：tangential pitting
切向纹孔式
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This is Scientific Americans 60-Second Science, Im Cynthia Graber. This will just take a minute. Not too long ago, scientists had to hoof it to the library to review the literature. And they had to flip through a card catalog to find that dusty old v
发表于:2018-12-24 / 阅读(144) / 评论(0)
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Colombia's Presidential Election Moves To A 2nd Round Pitting Right Against Left STEVE INSKEEP, HOST: The American Civil War ended in 1865. That was a long time ago. Yet there is a case to be made that many of our elections since then have replayed s
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2018年NPR美国国家公共电台5月
2018年NPR美国国家公共电台5月