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渭南哪里做包皮好普及时讯

2017年10月21日 16:18:27 | 作者:中华问答 | 来源:新华社
At one time it was believed that heat was a liquid. Sure, that sounds kind of crazy, but if you think for a second, you might see why. Suppose you have an object thatrsquo;s very hot ; say a metal spoon thatrsquo;s been sitting in hot coffee. Pick it up and you can feel the heat sping to your hand. The longer you hold on, the more heat seems to enter your hand. Ouch! Well, maybe heat is an invisible liquid that pours from the spoon into your hand. After all, that theory fits all the evidence, doesnrsquo;t it? But therersquo;s a problem. Another simple experiment you can do shows heat canrsquo;t be a liquid.曾有一段时间,有人认为热量是液体。当然,这听起来有点疯狂,但如果你仔细想一想,您可能会明白其中的道理。假设你有一个很热的物体;;放在热咖啡中的一个金属勺。拿起勺子,你能刚到热量蔓延到你的手,握的时间越长。传到你手上的热量越多。哎哟!好吧,也许热是一种无形的液体,它从勺子中倒入你的手中。毕竟,这理论符合所有的据,不是吗?但是有一个问题。你可以做另外一个简单的实验,来明热热量不是液体。201201/169390He arrived at Victoria Station on the 19th of May 1873, and soon found some lodgings somewhere in Battersea.他于1873年5月19日来到维多利亚车站,很快就发现了巴特西某处一些住宿的地方。He spoke decent English.他讲得一口地道的英语。It quickly improved.而且提高的也很迅速。Within weeks, he was ing Keats.短短几周之内,他已经可以读济慈了。London came at him from all sides.伦敦从四面八方容纳着他。It was the largest city in the World, and 4 million people had somehow squeezed themselves into it.这是世界上最大的城市,在某种程度上400万人在这座城市里挤来挤去。Here is what it looked like.这就是它看起来的样子。This is Gustave Dores London, published just before Vincent got here.这里是古斯塔夫·多尔的伦敦,在文森特到达这里前刚刚出版。Look at the states of it.看看它。This is Ludgate Hill, looking up towards St. Pauls.这是卢德门山,抬头是圣保罗。Look at those crowds.看看那些人群。Ive got a pal.我有一个朋友。A regular out and outer.离我渐行渐远。Vincent had a copy and treasured it.文森特拷贝了一份,将其视为珍宝。You might recognize this image as well.你可能也会认出这张画作。Its Newgate Prison.它就是新门监狱。Two decades later, he still hadnt forgotten it.二十年后,他仍然没有忘记它。注:听力文本来源于普特201206/188379

For those of us who live in the northern part of the ed States, perhaps no other season transforms the environment quite as much as winter.对于那些生活在美国北部的人来说,也许与其它季节相比,冬季的环境变化更大。Snow makes the world over so that its hardly recognizable.白雪使整个世界焕然一新,所以很难分辨事物。 The scenery isnt the only thing that changes during the winter season, though.然而,在冬季风景并不是唯一的变化。Todays Moment of Science is about how winter transforms the way the environment sounds.今日时差N小时为你讲述:在冬季,怎么去听声音的季节变化。Before that first snowfall, when the ground has hardened from the cold temperatures, sound experiences its first winter makeover.第一场雪前,因气温下降地面变硬,这时声音开始第一次季节性变化。Just as smooth, hard surfaces like glass reflect light, the smoother and harder a surface, the better it reflects sound.就如同玻璃反射光线一般,地面越光滑,越坚硬,反射的音效就越好。The harder ground of the early winter season absorbs less sound. Thus, acoustic waves retain more of their energy when they reflect off the ground.早冬时节地面越坚硬,被地面吸收的声音越少。因此声波在地表进行反射时,会保留更多的能量。As a result, early winter sounds are louder and clearer. Pay attention, and you might notice that everything sounds a little bit crisper.结果你会发现,早冬季节的声音听起来更响更清楚。如果注意听,你会发觉万物听起来都带点清脆。After the first snow, sound is made over again. The porousness of snow makes it absorb sound.第一场雪后,声音又发生了新的变化。积雪融化深入土壤,使地面吸收声音。Specifically, snow tends to absorb higher frequency acoustical waves.具体来说,积雪倾向于吸收震动率高的声波。As a result, sound becomes quieter and somewhat distorted.因此,听到的声音音量变低,并有所歪曲。Without looking out your window, you might know it snowed simply from noticing how bird calls or passing cars are slightly muffled.即使不看窗外,你也能通过倾听略微压低的鸟叫声和汽车开过的声音判断下雪了。If the snow lingers or it is topped with rain, winter sound will be made over once more. As snow hardens, it becomes smoother, less porous.如果持续下雪或者出现雨夹雪天气,声音会再次改变。雪会结成冰,因此会变得光滑,渗透性弱。As you can probably guess, this means that the snow will, like the hardened ground that preceded it, reflect sound well.可以猜到,这就意味着结冰的雪会像其覆盖的僵硬的地面一样,很好地反射声波。Sound will once again be crisp and clear.声音又会变得清晰明了。This winter, see if you can hear how the season transforms sound, as well as the scenery. 这个冬季在欣赏景色变换的同时,去听听季节是怎样改变声音的吧。201205/181947

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