VOA慢速英语 2009 0112a
时间：2018-12-15 作者：英语课 分类：VOA慢速英语2009年（一）月
This week in our report we are going to talk about adobe 1. No, not the information technology company in California, Adobe Systems. We mean the traditional building product made of soil and other materials. Adobe is shaped into bricks that are laid one on top of another and used as a low cost way to build walls and houses.
Adobe structures at Tumacacori National Historical Park in southern Arizona. The park protects the ruins of three Spanish colonial missions.
Adobe is soil that contains at least forty percent clay. In its purest form, clay can be shaped and stretched and used to make objects. Clay becomes very hard when it is put in a fire or a special oven called a kiln 2.
Adobe becomes a sticky mud when it is mixed with water. Liquid adobe mixture can be poured into containers called molds. This way the adobe can be shaped into bricks of the desired size.
Adobe bricks must be dried completely before they are used. This is necessary so that the walls of a building will not shrink or break.
Too much water can make adobe weak. Sometimes other materials are added to the adobe mixture to strengthen it. These materials help keep the water in correct balance with the soil. This will help the adobe resist changes in the weather and humidity.
One material that is commonly added to strengthen the adobe is straw. Straw is the dried stem part of plants such as wheat, millet 3 and sorghum 4. Straw is especially popular in places where the clay content of the soil is high.
Other materials such as lime and cement can be added to strengthen the adobe. About once a year, houses made from adobe should be given a layer of mud. This so-called paint job helps keep the adobe strong.
Adobe can take a long time to dry and become hard. So the bricks should be made in hot dry weather. If the weather is right, the bricks should dry in seven to ten days.
Many people around the world have found that adobe is a good way to make houses or farm buildings. But people who work with adobe must experiment. They must find the right combination of soil mix, water content and drying methods.
More information about adobe can be ordered from EnterpriseWorks/VITA, an anti-poverty group in Washington, D.C. The Web site is enterpriseworks.org. Click on News & Resources, then the link for Publications.
And that's the VOA Special English Development Report. Transcripts 5, MP3s and podcasts of our reports are at voaspecialenglish.com. I'm Steve Ember.
- They live in an adobe house.他们住在一间土坯屋里。
- Adobe bricks must drived dried completely before are used.土坯砖块使用前一定要完全干燥。
- That morning we fired our first kiln of charcoal.那天上午，我们烧了我们的第一窑木炭。
- Bricks are baked in a kiln.砖是在窑里烧成的。
- Millet is cultivated in the middle or lower reaches of the Yellow River.在黄河中下游地区，人们种植谷子。
- The high quality millet flour was obtained through wet milling.采用湿磨法获得了高品质的小米粉。
- We can grow sorghum or maize on this plot.这块地可以种高粱或玉米。
- They made sorghum into pig feed.他们把高粱做成了猪饲料。
- Like mRNA, both tRNA and rRNA are transcripts of chromosomal DNA. tRNA及rRNA同mRNA一样，都是染色体DNA的转录产物。 来自辞典例句
- You can't take the transfer students'exam without your transcripts. 没有成绩证明书，你就不能参加转学考试。 来自辞典例句