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Heres something we tend to take for granted: drop a few ice cubes into a glass of water at room temperature, and in a few minutes the water will cool. How does this work? 有件事情我们总觉得理所当然：室温下把一些冰块放入水中，
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How Does Ice Cool Drinks? Heres something we tend to take for granted: drop a few ice cubes into a glass of water at room temperature, and in a few minutes the water will cool. How does this work? Heat is a measure of molecular activity: the faster a
英语听力文摘 English Digest
What Makes Windshield Glass So Tough? We tend to think of glass as fragilebut in fact, glass is pretty strong stuff. A flawless fiber of glass pulled lengthwise is five times stronger than steel! Although glass is quite strong, its also very brittlea
英语听力文摘 English Digest
042 The Flint A soldier was walking down a country road. He was coming back from a battle. He was wearing a knapsack on his back and a big sword on his waist. When he was walking down the road so tired, he found a witch. The witch was sitting right n
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AUDIE CORNISH, HOST: Today marks exactly one year since the mayor of Flint, Mich., declared a state of emergency because of lead in the city's drinking water. While the water system as a whole is improving, Michigan Radio's Lindsey Smith reports filt
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That doesn't necessarily follow. 这不能算作一个理由。 There are certain Fulton-style guns perfected by the Englishmen Philippe-Coles and Burley, the Frenchman Furcy, and the Italian Landi; they're equipped with a special system of airtight
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