单词：sphingosine-1-phosphate
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pH - a measure of how acid or alkali a solution is. As the pH gets lower, the solution is more acid. At a pH of 7 the solution is neither acid nor alkali. pH is the inverse of the logarithm of the con
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This is Scientific American's 60-Second Science. I'm Cynthia Graber. This will just take a minute. Batteries of the future need to deliver more energy, and they need to be smaller. Researchers at MIT think they have developed a technology that can, a
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The Mass这首歌是由一个叫Era的现代乐团所唱的。《The Mass》传承了Eric Levi自首张专辑《Era》起便汲汲经营的音乐特色，匠心独具的融合流行、摇滚及古典乐，经过截枝去叶后而产生简洁有力的音
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U.S. President Barack Obama travels Friday to Trinidad and Tobago to attend the fifth Summit of the Americas, a gathering of all hemispheric leaders minus Cuba. U.S. officials say the summit is an opportunity to forge a regional response to the glob
VOA标准英语2009年(四月)
'Slum Film Festival' Showcases Urban Stories The festival is a community-based event, featuring films by and about people living in urban slums, screened in the open air. The event allows filmmakers to show their work to residents of the areas where
VOA标准英语2012年(八月)
This past Friday night, I was settling in for the evening, when my youngest son said, Mum, can we go to the family bingo night at school? I groaned inside, not wanting to go anywhere. I had received an automated voice message from the school a few da
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