单词：dinitrothiophosphate
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牛津阅读树ORTMP3（1-11级）
There has been a settlement here since about 500 B.C., but Rothenburg didn't really come into its own until the Holy Roman Emperor Rudolf the First, chartered it as a free imperial city in 1274. Rothe
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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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dinks sandwich generation 我们上次给大家介绍了baby boomers和yuppies。 这是两个反映美国社会变化的习惯用语。今天我们再给大家讲两个这方面的俗语。在第二次
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The Edinburgh International Festival is over fifty years old and has earned its reputation as one of the world's greatest celebrations of the arts. The founders of the Festival believed that the Festival programmes should be of the highest possible a
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