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Airplane Engines In 1945, a new type of airplane engine was invented. It was much lighter and more powerful than earlier engines, and enabled warplanes to fly faster and higher than ever. This type of engine was called the jet engine because it below
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[00:04.57]Excitement fills the early morning air as you arrive at learn to recognize and name each part of the parachute. [00:19.17]You also learn what each part does. [00:22.05]The excitement builds as your teacher describes each stetp it of the jum
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34 Buying Books on the Internet It's easy to order books from the Internet. There are several companies that ship books to customers in China. Just decide which company you would like to use and type that company's name into the search engine. The co
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今天我们要讲的两个习惯用语都有一个共同的关键的字。那就是：Wool. Wool就是羊毛，或者是呢绒。但是，wool在和其他字合起来成为习惯用语的时候，它就不一定跟羊毛或呢绒有任何关系了。我
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