弯脚圆规,微调小圆规

NPR 2011-06-07

From NPR News in Washington, I'm Lakshmi Singh. The White House is reaffirming what it calls a real drawdown of US forces in Afghanistan. This hours after the president met with his advisors to review US policy in that region. NPR's Ari Shapiro repor

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2、有些名词为自然复数名词，即只有复数的形式，例如： trousers（裤子）glasses（眼镜）scales（天平）tongs（夹子）binoculars（双筒望远镜） pincers（手钳）compasses（圆规）pants（裤子）crossroads（

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薄冰实用英语语法详解

iPhone 5的官方宣传广告片

iPhone 5的官方宣传广告片 When you think about your iPhone, it's probably the object you use the most in your life. It's the product that you have with you all the time. With this unique relationship people have with their iPhone, we take chan

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[00:01.56]Gunpowder [00:03.47]Gunpowder was invented by the Chinese [00:05.73]in the eighth century AD. [00:08.28]Early Chinese scientists discovered [00:10.64]that they could make an explosive substance [00:12.76]by mixing sulphur,charcoal and saltp

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SAN FRANCISCO, Sept. 22 (Xinhua) -- Former eBay Chief Executive Officer and California governor candidate Meg Whitman on Thursday was named Hewlett-Packard's new CEO, replacing Leo Apotheker who served 11 months on the job. We are fortunate to have s

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By calculating how old the rocks are where we find these ancient compasses, we can figure out how long ago the magnetized parts were locked in. That tells us which direction was magnetic north tens of thousands of years ago. Surprisingly, its not alw

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