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VOA慢速英语 2007 1211a

时间:2008-03-20 02:38来源:互联网 提供网友:蓝静子   字体: [ ]

This is the VOA Special English Agriculture Report.

In the sea, at the base of what scientists call the food web, are single-celled plants. These microscopic1 algae2 provide the energy for the web that feeds higher forms of life.

Algae-affected waters in Hong Kong's Victoria Harbor in June, after a harmful bloom near the southern Chinese city of Shenzhen
Under some conditions, algae suddenly begin to spread very quickly, an event known as a bloom. Usually blooms are not harmful. But some kinds of algae produce poisons. These toxins3 can be deadly to sea animals and also dangerous to people.

When algae bloom, they can discolor the water as they form dense4 areas near the surface. You may have heard the term "red tide." But experts at the Woods Hole Oceanographic Institute in Massachusetts say this is incorrect.

Blooms are not connected with tides. And they not always red -- the water can appear brown or greenish. And, in fact, some algae can be harmful without discoloring the water.

So instead of "red tide," scientists use the term "harmful algal (al-ghul) bloom." Algal is the adjective form of alga, a single plant. But they also just say HAB for short.

The toxins can very quickly kill fish, such as herring and anchovies5, that feed on algae. But even if they survive they can be dangerous to eat. Not only that, bigger fish that eat the algae-eaters may also be dangerous.

Some toxins harm only sea life. But others can cause severe stomach and intestinal6 problems as well as neurological disorders7 and even death in people. The only way to know if these toxins are present, unless people get sick, is through laboratory testing of fish and shellfish.

Experts say the meaty or hard muscle parts of shrimp8, crab9, scallops and lobster10 are safe to eat because they do not absorb the poison. But people should not to eat the liver or other organs or soft tissues. Also, people should not eat other kinds of shellfish during a HAB. These include oysters11, clams12, mussels and whelks.

In the United States, the government says harmful algal blooms cause more than eighty million dollars in economic losses each year. A government report in July noted13 that HABs are widely believed to be increasing worldwide.

The report was the first step in a process to create a plan for predicting and dealing14 with them in American waters. In Florida, for example, satellites and computer models are now being used to provide algae forecasts that are just like weather reports.

And that’s the VOA Special English Agriculture Report, written by Jerilyn Watson. For links to more information about harmful algae, go to voaspecialenglish.com. I’m Steve Ember.



1 microscopic nDrxq     
  • It's impossible to read his microscopic handwriting.不可能看清他那极小的书写字迹。
  • A plant's lungs are the microscopic pores in its leaves.植物的肺就是其叶片上微细的气孔。
2 algae tK6yW     
  • 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。
3 toxins 18c3f40d432ba8dc33bad8fb82873ea8     
n.毒素( toxin的名词复数 )
  • The seas have been used as a receptacle for a range of industrial toxins. 海洋成了各种有毒工业废料的大容器。
  • Most toxins are naturally excreted from the body. 大部分毒素被自然排出体外。 来自《简明英汉词典》
4 dense aONzX     
  • The general ambushed his troops in the dense woods. 将军把部队埋伏在浓密的树林里。
  • The path was completely covered by the dense foliage. 小路被树叶厚厚地盖了一层。
5 anchovies anchovies     
n. 鯷鱼,凤尾鱼
  • a pizza topped with cheese and anchovies 奶酪鳀鱼比萨饼
  • Pesto, mozzarella, parma ham, sun dried tomatoes, egg, anchovies. 核桃香蒜,马苏里拉,巴马火腿,干番茄,鸡蛋,咸鱼。
6 intestinal DbHzX     
  • A few other conditions are in high intestinal obstruction. 其它少数情况是高位肠梗阻。 来自辞典例句
  • This complication has occasionally occurred following the use of intestinal antiseptics. 这种并发症偶而发生在使用肠道抗菌剂上。 来自辞典例句
7 disorders 6e49dcafe3638183c823d3aa5b12b010     
n.混乱( disorder的名词复数 );凌乱;骚乱;(身心、机能)失调
  • Reports of anorexia and other eating disorders are on the increase. 据报告,厌食症和其他饮食方面的功能紊乱发生率正在不断增长。 来自《简明英汉词典》
  • The announcement led to violent civil disorders. 这项宣布引起剧烈的骚乱。 来自《简明英汉词典》
8 shrimp krFyz     
  • When the shrimp farm is built it will block the stream.一旦养虾场建起来,将会截断这条河流。
  • When it comes to seafood,I like shrimp the best.说到海鲜,我最喜欢虾。
9 crab xoozE     
  • I can't remember when I last had crab.我不记得上次吃蟹是什么时候了。
  • The skin on my face felt as hard as a crab's back.我脸上的皮仿佛僵硬了,就象螃蟹的壳似的。
10 lobster w8Yzm     
  • The lobster is a shellfish.龙虾是水生贝壳动物。
  • I like lobster but it does not like me.我喜欢吃龙虾,但它不适宜于我的健康。
11 oysters 713202a391facaf27aab568d95bdc68f     
牡蛎( oyster的名词复数 )
  • We don't have oysters tonight, but the crayfish are very good. 我们今晚没有牡蛎供应。但小龙虾是非常好。
  • She carried a piping hot grill of oysters and bacon. 她端出一盘滚烫的烤牡蛎和咸肉。
12 clams 0940cacadaf01e94ba47fd333a69de59     
n.蛤;蚌,蛤( clam的名词复数 )v.(在沙滩上)挖蛤( clam的第三人称单数 )
  • The restaurant's specialities are fried clams. 这个餐厅的特色菜是炸蚌。 来自《简明英汉词典》
  • We dug clams in the flats et low tide. 退潮时我们在浅滩挖蛤蜊。 来自辞典例句
13 noted 5n4zXc     
  • The local hotel is noted for its good table.当地的那家酒店以餐食精美而著称。
  • Jim is noted for arriving late for work.吉姆上班迟到出了名。
14 dealing NvjzWP     
  • This store has an excellent reputation for fair dealing.该商店因买卖公道而享有极高的声誉。
  • His fair dealing earned our confidence.他的诚实的行为获得我们的信任。
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