单词:tool face tangential force
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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(30) / 评论(0)
Scientific American(七)月
Earth's magnetic field has reversed thousands of times since its formation 4.5 billion years ago. And scientists now believe that the next reversal is imminent. The race is on to predicting exactly when it will occur. In 2010, the European Space Agen
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自然百科2011年
Do you know failure works? It can be a key. It can be a tool. It can be a teacher. It's on your own will how you face it. It is your own choice. Be wise on how you do with it. 你知道失败的用处吗? 它可以是一把钥匙 一个工具 或者一
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