单词：ultrahigh sand concentration
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biology class This happened in a university biology class. The professor was explaining that sperm has a high concentration of dextrose. One freshman girl who looked puzzled asked, Then why doesn't it taste sweet? Notes: 1. This happened in a univers
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Some methods of preserving food are easy to understand. 一些保存食物的方法很容易理解。 For example, it's easy to see that freezing your food, or packing it in salt, would make it inhospitable to the microbes which would otherwise cause
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Pre-Listening Vocabulary spoil: to go rotten high concentration: a large amount of one substance inside another thrive: to do or live well crystallize: to change form and become solid crystals nourish: to provide materials needed for growth and healt
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China has long depended on coal-burning power plants to fuel its explosive growth over the past three decades. As a result, air pollution has risen to alarming levels in central and eastern regions. Policymakers have been working hard to shift the co
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老爷子 David Bowie 复古新单《I'd Rather Be High(Venetian Mix)》！本次 MV 采用了第一次世界大战期间的多个珍贵视频镜头，其中包括军官与女士们戴着防毒面罩在舞池中翩翩起舞的片段。在那战火纷飞
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Some methods of preserving food are easy to understand. For example, it's easy to see that freezing your food, or packing it in salt, would make it inhospitable to the microbes which would otherwise cause it to spoil. You might wonder, however, about
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