单词：cesium iridium alum
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1: I am Andy. 2: Hello! 3: Good morning. 4: This is Kay. 5: This is Miss Dizzy. Your English teacher. 6: How do you do. 7: Hi! 8: Good bye! 9: So long. 10:Bye-bye! A: Hello! I am Andy. Hello! I am Mr. Write. I am Bobby. I am Kay. B: Good morning Mr.
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[00:06.37]The United States has a new official clock. [00:10.95]The clock began operating late last year in the American city of Boulder,Colorado. [00:18.39]Experts say the new clock is so exact that it will neither gain nor lose so much as one secon
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The K-T boundary marks the end of the age of dinosaurs, and the beginning of the age of mammals. KT界限层标志着恐龙时代的终点和哺乳动物时代的开端。 But does the K-T boundary really signify the absolute end of all dinosaurs? 不过
侏罗纪搏击俱乐部
Youve given some thought to oxygen, carbon, uranium. But youve probably never mused about the element ytterbium, symbol Yb. A new study by scientists at the National Institute of Standards and Technology, or NIST, says that ytterbium could find a rol
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Donny Hathaway, who gained fame in the 1970s as a Grammy Award-winning singer, songwriter and producer, left behind some of soul music's most-compelling tunes, including his 1973 hit, Love, Love, Love. The smooth jazz rendition from Kirk Whalum's alb
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US Company Developing Space-Based Plane Tracking 美国公司开发太空基地飞机追踪技术 LEESBURG, VA One of the reasons Malaysia Airlines flight MH370 hasn't been found is because the plane couldn't be tracked continuously over the ocean. I
VOA标准英语2015年(八月)