VOA慢速英语《农业报道》文本：第25课.doc

1、英语翻议讲解：稻壳是稻谷外面的一层保护物。仅去掉稻壳的稻米叫做糙米，去掉麸皮的米叫做精米。一经收获，稻壳就没用了。他们可能被丢到垃圾填埋场或被燃烧。有时，它们也被用在养鸡场吸收废物。其他时候，用来改良土壤。但是德克萨斯一名化学家有另外一个想法。Rajan Vempati领导的组织研制一种将稻壳转化为灰烬的新方法，用来替代传统用来制作混凝土的波特兰水泥。波特兰水泥用来在混泥土中将啥子和碎石粘在一起。Rajan Vempati认为，稻壳灰烬科技帮助混凝土行业减少二氧化碳排放量。在水泥的生产过程中，燃料燃烧和石灰石加热过程中都会释放出二氧化碳。波特兰水泥协会表示，在混凝土老化的过程中，石灰石释放的气

2、体会被重新吸收。但是水泥生产过程释放的二氧化碳占世界人类释放的二氧化碳总量的5%。二氧化碳通过吸热来影响气候。在制作稻壳灰烬的过程中，将稻壳加热至800摄氏度。碳被移除，仅剩纯硅石的细小颗粒。该过程释放一些二氧化碳，但是Rajan Vempati表示，这些二氧化碳会在自然状态下承诺更新被土壤吸收。另外一位发明家Prasad Rangaraju是南卡罗莱纳克莱姆森大学的工程师。他对水泥进行了测试。他表示，这可以减少水泥的用量，因为稻壳灰烬使混凝土更加坚固。发明者们还表示，浅色的材料反光性能更好，这样建筑在制冷方面的成本降低。全国混凝土制成品协会指出，在水泥中使用灰烬不是一个新想法。古罗马人已经发

3、现火山灰制作的水泥质量更好。但是现代发明者表示，稻壳灰烬比其他材料更好。他们的研究过程受到美国国家科学基金会的资金支持。目前，该产品还没有推向市场。稻壳灰烬已经比较容易获得，但是这种产品的成本相对来说比较高。成本，包括交通在内，将会决定这种新技术的成败。在农民种植稻米比较多，而稻壳会变成废物的地方，这种方法可能能够行得通。1.landfill n.填埋场 垃圾填埋场2.absorb vt.吸收（液体、气体等）; 吸收（热、光、能等） 例句：Dry earth absorbs water quickly. 干土吸水很快。3.amend vt.vi.改良; 修改, 修正，修订（法律文件、声明等）

4、例句：The thief has amended. 这小偷改过自新了。 You must amend your pronunciation. 你必须改正你的发音。4.crushed adj.压碎的,粉碎的例句：Several people were crushed to death by the falling rocks. 有几个人被落下的岩石压死了。5.age vi.变老,老化例句：After his wifes death, he aged quickly. 妻子死后, 他老得很快。6.affect vt.影响 例句：The tax increases have affected us

5、all. 加税已经影响了我们所有的人。7.trap vt.诱骗; 诱捕; 设陷阱捕捉 例句：How many rabbits have you trapped in your special trap this week? 这个星期你用特制的捕兽器捉了多少只兔子?8.particle n.粒子,颗粒;虚词,小品词例句：There are particles of dust in the air. 空气中有尘粒。9.available adj.可用的或可得到的 例句：Ill send you all the periodicals available. 我将把我能得到的期刊给你寄去。 My bi

6、cycle is not available, and it is being repaired. 我的自行车现在不能用, 因为正在修理。10.relatively ad.相对地,比较地例句：She walks relatively fast for a child of three. 她作为三岁的孩子走得还比较快。1.Once rice is harvested, the hulls are out of a job. Once引导状语从句once用作连词时，意为“一旦就”，用于连接时间状语从句，相当于as soon as。如：Once you start, you will never g

7、ive up. 一旦你开始了，你就不要放弃。Once you begin to read it, you will like it. 一旦你开始读，你就会喜欢它。Physics is easy to learn once you understand the rules. 一旦你理解了规则，物理就不难学了。注意：once引导的是时间状语从句，从句要用一般现在时代替将来时。out of a job失业，没用He was out of a job for six months. 他已失业半年了。2. Carbon is driven out, and fine particles of almos

8、t pure silica remain. drive out把赶出去,驱逐,驱赶例句：I watched him drive the cattle out. 我看着他把牛赶出去。 They drove foreign goods out of the market. 他们把外国货驱逐出市场。3.Also, the inventors say the light-colored material better reflects sunlight, so buildings would cost less to cool.light-colored是合成词，颜色浅的4.Using it coul

9、d make the most sense in areas where farmers grow lots of rice and the hulls might just go to waste.make sense有道理；有意义；讲得通 例句：This sentence doesnt make any sense. 这个句子没有意义。 It doesnt make any sense to get up so early. 那么早起来没有任何意义。英语听力原文：This is the VOA Special English Agriculture Report.Rice hulls, o

10、r husks, are the protective coverings on grains of rice. Rice with just its hull removed is brown rice. Rice without its hull or bran is white rice.img rice is harvested, the hulls are out of a job. They may be taken to landfills or burned. Sometimes they are used to absorb waste in chicken houses.

11、Other times they are used to amend soil.But a chemist in Texas has another idea.Rajan Vempati led a group that developed a new process to make rice hulls into ash. The idea is to replace some of the portland cement traditionally used in making concrete. Portland cement is a material that holds toget

12、her the sand and crushed stone in concrete.Rajan Vempati thinks rice hull ash could help the concrete industry produce less carbon dioxide. Carbon dioxide is released in cement manufacturing when fuel is burned and limestone is heated. The Portland Cement Association says the gas from the limestone

13、is reabsorbed as concrete ages.But cement manufacturing produces around five percent of the carbon dioxide released by human activity worldwide. Carbon dioxide is one of the gases that may affect the climate by trapping heat.The process for making rice hull ash heats the hulls to eight hundred degre

14、es centigrade. Carbon is driven out, and fine particles of almost pure silica remain. The process releases some carbon dioxide, but Rajan Vempati says it would be reabsorbed into the soil naturally.Another inventor, Prasad Rangaraju, is an engineer at Clemson University in South Carolina. He tested

15、the cement, and says less could be used because the rice hull ash makes it a stronger building material. Also, the inventors say the light-colored material better reflects sunlight, so buildings would cost less to cool.The National Ready Mixed Concrete Association points out that using ash in cement

16、 is not a new idea. The ancient Romans discovered that volcanic ash made better cement.But the modern inventors say rice hull ash works better than other materials. They developed the process with money from the National Science Foundation. They have not yet brought it to market.Rice hull ash is alr

17、eady available, but the product is relatively costly.Cost, including transportation, may decide the success of the new technology. Using it could make the most sense in areas where farmers grow lots of rice and the hulls might just go to waste.And thats the VOA Special English Agriculture Report, written by Jerilyn Watson with Steve Baragona. Im Bob Doughty.版权所有：高考资源网()版权所有：高考资源网()