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2019年12月06日 19:22:25来源:好解答

Today on Congressional Moment On July 7th, 1919, the U.S. Army assembled 81 motorized vehicles and 288 men in Washington, D.C. 1919.7.7国会时刻的今天,美国陆军在华盛顿特区集合了81辆机动车辆和288人。Their mission: to drive across the country. 他们的任务是:开车穿越这个国家。This transcontinental convoy dealt with all the poor driving conditions of the time.... incomplete or non-existent roads of dirt or sand, unsturdy bridges, and treacherous conditions from bad weather. 这横贯大陆的车队忍受了那段时间所有开车的恶劣条件。。。驾驶环境的不完整,根本不存在的泥沙路,晃晃悠悠的桥以及恶劣天气所带来的危险因素。They arrived in San Francisco 62 days later, averaging a cross-country speed of 5 miles an hour. 62天之后他们到达了旧金山,每小时平均穿越一个国家。One volunteer observer on the arduous journey was a 29 year-old soldier named Dwight Eisenhower. 这趟艰辛旅途的自愿观察者是一个叫Dwight Eisenhower的29岁士兵。Twenty years later, the Bureau of Public Roads had identified to Congress the need for a national road system to improve connections between cities and states. 20年之后,公共道路局已向国会实确实需要国家公路系统来改善城市和州之间的联系。After World War II, Congress was able to fully address this massive undertaking. There were many concerns: states wanted assurance that the government would pay its fair share of construction costs. 二战之后,国会全力解决这个艰巨的任务。但还是存在很多担忧:各州想得到保,政府愿意付建筑费用的合理份额。Rural residents thought the new highways might limit access to small communities. 乡下居民认为新的高速路会限制接触小社区的机会。In 1953, Dwight Eisenhower became President. Three years later, with construction and financing approved, the Federal-Aid Highway Act of 1956 was signed into law. 1953年,Dwight Eisenhower当选为总统。三年之后随着建设和融资的批准,1956年的《联邦助建高速公路法》法案签署成为法律。Creating over 35,000 miles of roadway, the Interstate Highway System was completed in 1975. 建造超过35000英里的道路,1975年完成州际高速公路系统的建造。原文译文属!201307/248111。

  • Here’s an at-home experiment you can try.你可以在家做这样的实验。Take a can of “classic” Coca-Cola and a can of Diet Coke, and without opening either one submerge them in water. A deep sink or a bucket will do the trick. You’ll find the can of Diet Coke rises to the top, while the Classic Coke stays sunk. Can you guess why?把没打开过的两听可乐(含糖,无糖)放在深槽或者高桶中,里面的水淹没两听可乐,你会发现无糖可乐浮在水面;而含糖可乐却沉下去了。你能猜到原因吗?The answer lies in the chemical contents of the Diet Coke — in fact, in the very distinction that makes it “Diet”. Although their ingredients are otherwise similar, Diet Coke is not made with real sugar: instead, the makers of Coca-Cola products have replaced the sugar with a synthetic chemical called Aspartame.奥秘就在于无糖可乐的成分,这也是“无糖”的原因。虽然,无糖可乐和普通可乐的成分很相似,无糖可乐中添加的并非真正的糖,而是一种做“阿斯巴甜”的合成化学物。Aspartame, which is commonly known as Nutrasweet, is a kind of substitute sugar — intended to mimic the distinctive taste of sugar without carrying the associated calories.“阿斯巴甜”是一种常见的代糖甜味剂,不含糖的热量却有糖的甜味。High Molecular Density高分子密度Real sugar has a high molecular density. In other words you can think of sugar molecules as being thickly packed together.真正的糖分子密度高,也就是说糖分子紧密地排列在一起。This also means sugar molecules themselves will be relatively heavy, even when dissolved in solution. In the case of the sinking Coke, the real sugar content is acting as an anchor for the can.即使溶解在溶液中,相同体积的糖更重。实验中沉下去的普通可乐,正是因为糖成分像锚般让罐子下沉。Coca-Cola Taste可乐的味道There’s also the fact that Nutrasweet is much sweeter than sugar, and so less is needed per can to achieve that recognizable Coca-Cola taste. Thus the bobbing Diet Coke not only has a lower average density, it also has a lower mass — there’s less “stuff” dissolved in the mixture. If you were an advertising executive, you might want to market diet sodas as “Light” — it wouldn’t be far from the truth.代糖比糖甜,所以更少的代糖能达到普通可乐的甜味。这样水中摇摆的无糖可乐不仅平均密度更低,质量也比普通可乐轻——因为更少的代糖溶解在可乐中。如果你是广告商,你可以这样宣传——无糖碳酸饮料的优点:轻。这可没有说大话。 /201304/235016。
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