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Potential energy in a crossbow When we think of the concept of energy, we often think of objects in motion: a car rolling down a hill or a jogger running up a hill. This kind of energy-in-motion, called kinetic energy, isnt the only kind of energy. A
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英语时差8，16
英语时差8，16
James Monroe easily won election in 1816. He had a relaxed, likeable personality and was popular with voters. In addition, many saw him as a last connection to the countrys founding generation. Monroe had fought in George Washingtons army during the
发表于:2019-01-02 / 阅读(293) / 评论(0)
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枪在美国历史上曾经起了重要的作用。枪是探险家、垦荒者和牛仔必不可少的伴侣。这固然已经是陈年往事，但是这段流逝的岁月却在语言中留下了自己的脚印；美国英语里至今还有不少习惯
发表于:2019-01-16 / 阅读(375) / 评论(0)
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