Storing Drinking Water
时间：2018-11-27 作者：英语课 分类：VOA2003（下）-发展与科学
Broadcast: August 4, 2003
This is Bill White with the VOA Special English Development Report.
Safe drinking water has always been rare and valuable. Throughout the world, drinking water has to be stored for periods of low rainfall. Tanks or other containers for water storage must be ready long before a dry season begins.
For hundreds of years different kinds of materials have been used to build water storage containers. In many areas of the world, small lakes or 1)reservoirs 2 formed by dirt walls provide drinking water for villagers during the long dry season. In western Sudan, the thick part of the 2)baobob tree is removed to store water collected during the short rainy season in that country.
Bricks 3 and concrete are among the modern materials used today to build storage containers for water. A solid rock can be used as the bottom of a water tank. However, a mixture of rock and soil should not be used. The soil will settle down, but the rock will not. The water will leak out.
3)Ferro-cement 4 structures are popular in some developing countries, especially in India. Ferro-cement is made by pouring a sand and cement mixture over a 4)skeleton 5 form made of steel rods 6, pipe, or chicken wire. It creates a structure that is lightweight yet keeps in water. The walls of ferro-cement structures are usually thin, which means that they can be used in building different shapes such as circles.
Wood also can be used for water storage structures. 5)Cypress 7, fir, pine and redwood are some of the kinds of trees that have been used. Wooden tanks do not require special care, although their average lifetime is shorter than tanks made with concrete or steel. Any chemicals used to keep the wood from being ruined must not be poisonous substances.
Water in uncovered 8 storage tanks or reservoirs can become unsafe. Small green plants called 6)algae 9 can grow in large amounts near the surface. The algae may help bacteria continue to grow, even if chemicals such as chlorine are added to the water to kill the bacteria. Uncovered water also can be polluted by birds, animals or humans.
You can learn more about storing water for drinking through the Volunteers in Technical Assistance 10, or VITA. VITA is on the Internet at www.vita.org.
This VOA Special English Development Report was written by Gary Garriott. This is Bill White.
注释：
1) reservoir 1 [5rezEvwB:] n.水库, 蓄水池
2) baobob [5beiEbAb] n.猴面包树, 非洲产的一种巨树
3) Ferro-cement 铁结合的
4) skeleton [5skelitEn] n.骨架, 基干
5) cypress [5saipris] n（植）柏科树的, 柏木属植物
6) algae [5AldVi:] n.藻类, 海藻
- The town is supplied with water from a reservoir.该城镇由小山中的一座水库供水。
- A large quantity of water is stored in the reservoir.水库存了大量的水。
- We must make use of our untapped reservoirs of talent. 我们必须利用我们尚未利用的人才。 来自《简明英汉词典》
- The big storms in August refilled the reservoirs. 八月的暴雨又使水库积满了水。 来自《简明英汉词典》
- He compounded water, sand and soil and formed bricks. 他用水拌和沙和泥土做成砖块。
- The United Auto Workers hit the bricks against General Motors. 联合汽车工人工会举行罢工，反对通用汽车公司。
- We need 100 tons of cement at most for this project.这项工程满打满算有一百吨水泥就足够了。
- Let's cement the parts together.咱们来把这些部件粘接在一起吧。
- A long illness made a skeleton out of him.长期的卧病使他骨瘦如柴。
- Her notes gave us just the bare skeleton of her theory.她的笔记只给我们提供了她的理论的梗概。
- The wheels of the toy car were fixed on metal rods. 玩具车的轮子固定在金属棒上。
- A typewriter in which the characters are situated on type rods. 一种打字机，其字符安装在字模棒上。
- The towering pine and cypress trees defy frost and snow.松柏参天傲霜雪。
- The pine and the cypress remain green all the year round.苍松翠柏，常绿不凋。
- His head was uncovered. 他光着头。
- A plot to assassinate the banker has been uncovered by the police. 暗杀银行家的密谋被警方侦破了。 来自《简明英汉词典》
- Most algae live in water.多数藻类生长在水中。
- Algae grow and spread quickly in the lake.湖中水藻滋蔓。
- She called and called but no one came to her assistance.她叫了又叫，但没有人来帮。
- He will get the great possible assistance.他将获得尽可能大的帮助。