单词：hydrogenproducing acetogenic bacteria
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Bacteria are extremely small living things. While we measure our own sizes in inches or centimeters, bacterial size is measured in microns. One micron is a thousandth of a millimeter: a pinhead is about a millimeter across. Rod-shaped bacteria are u
新概念优美背诵短文50篇
Bacteria are extremely small living things. While we measure our own sizes in inches or centimeters, bacterial size is measured in microns. One micron is a thousandth of a millimeter: a pinhead is abo
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Where Does Bad-breath Odor Come From? We all have offensive breath at one time or another. In most cases, offensive breath originates from bacteria in the mouth, although there are other more surprising causes. Until a few years ago, the most doctors
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We all have offensive breath at one time or another. In most cases, offensive breath originates from bacteria in the mouth, although there are other more surprising causes. Until a few years ago, the most doctors could do was to counsel patients with
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By Paul Sisco Washington 28 March 2007 watch Ethanol Racing report If it works for one, the rest usually follow suit. That's the way it is in motor racing. This year all 33 race cars in the Indianapolis 500 are running on ethanol, not gasoline, not
2007年VOA标准英语（三月）
Sewage stinks. But bacteria can make it smell better. Oh, yeah? That's true. Certain forms of bacteria feasting on sewage give off hydrogen sulfide, a really malodorous chemical, and one of several that give sewage its pleasing smell. In general this
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