单词：meter-kilogram-second-ampere
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For nearly 130 years, the worlds scientists have used a singular small, metal cylinder to define the exact weight of a kilogram. But that is about to change. The cylinder was made in 1889 of platinum and iridium metals. It is called the Grand K. The
2018年VOA慢速英语(十一)月
一个英语单词可分为三部分：前缀（prefix）词根（root）后缀（suffix）。位于词根前面的部分就是前缀。前缀，可以改变单词的意思。 ir-（放在同辅音词根前）表示不，无 irrational = ir + rationa
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Most of the winners on the fifth full day of competition at the Beijing Olympics will come from sports not widely followed. But as VOA's Jim Stevenson reports from the Chinese capital, their victories will mean as much as the gold medals claimed in
VOA标准英语2008年（八月）
DAVID GREENE, HOST: So every time you weigh something, whether it's coffee or bananas - I'm not sure what you're weighing - you might be doing it in pounds - well, whatever you're doing, you're unknowingly relying on a global system of measurement th
2018年NPR美国国家公共电台11月
与数字有关的英语词根总结 milli-【千分之一】例：milliampere（毫安）=milli（千）+ampere（安培） centi【百分之一】例：centimeter（厘米）=centi（百分之一）+meter（米） deci【十分之一】例：decibe
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Including the start of the Olympic football tournament two days before the Opening Ceremonies, the Beijing Olympics have reached the halfway point of scheduled competition. VOA's Jim Stevenson has this preview of the action Friday, which is highligh
VOA标准英语2008年（八月）