英语听力：自然百科 泰晤士河

 The River Thames runs over 200 miles through the British countryside and on to the city of London. Each day, thousands of visitors enjoy the pleasures of just being on the river. But as little as 40 years ago, this body of water had become one of Europe's most polluted rivers with a noxious¹ legacy².

In 1858, the British Houses of Parliament were evacuated³ when the stench from the River Thames had become unbearable⁴. Untreated sewage had been leaking straight into the Thames. Victorian engineer Joseph Bazalgette remedied the situation by designing an extensive network of sewers⁵. However, a century later, the growing population has stretched it to the limit. The majority of the old system is still in use today. It's simply too expensive to replace it, and it's still causing big problems.

"And that's Western Pumping Station. It's part of the original Victorian sewage system for London. When the system is overloaded⁶ by rainfall, we have this problem again with overflowing⁷ sewage, and that pumping station can discharge up to about 50 thousand tons an hour with mixture of untreated sewage and urban run-off."

The sewage causes oxygen depletion⁸ in the river, killing⁹ fish and other marine¹⁰ life. Enter one of these vessels¹¹. This is the Vitality¹², and it can pump up to 30 tons of oxygen into the water in a day. The whole process of injecting river water with pure oxygen takes only a few minutes. The irony¹³ is that the only reason a system like this is necessary is because the Thames is now so much cleaner than it was even 50 years ago. Fish have returned. It's one of the most important fish nurseries in Britain with around 120 species.

"The Thames is fantastic asset. It's a flood defense¹⁴ mechanism¹⁵ and drains the whole basin. It supplies, for instance, 2/3 of London's drinking water. I really like it to be a busy, active river which is sort of appreciated and enjoyed by all types of people, yet one which is still renowned¹⁶ as being a haven¹⁷ for wildlife."

The regeneration of this river is a wonderful success story. But it will be a constant battle to keep it that way.

1 noxious   

adj.有害的，有毒的；使道德败坏的，讨厌的

参考例句：

• Heavy industry pollutes our rivers with noxious chemicals.重工业产生的有毒化学品会污染我们的河流。
• Many household products give off noxious fumes.很多家用产品散发有害气体。

2 legacy   

n.遗产，遗赠；先人(或过去)留下的东西

参考例句：

• They are the most precious cultural legacy our forefathers left.它们是我们祖先留下来的最宝贵的文化遗产。
• He thinks the legacy is a gift from the Gods.他认为这笔遗产是天赐之物。

3 evacuated   

撤退者的

参考例句：

• Police evacuated nearby buildings. 警方已将附近大楼的居民疏散。
• The fireman evacuated the guests from the burning hotel. 消防队员把客人们从燃烧着的旅馆中撤出来。

4 unbearable   

adj.不能容忍的；忍受不住的

参考例句：

• It is unbearable to be always on thorns.老是处于焦虑不安的情况中是受不了的。
• The more he thought of it the more unbearable it became.他越想越觉得无法忍受。

5 sewers   

n.阴沟，污水管，下水道( sewer的名词复数 )

参考例句：

• The sewers discharge out at sea. 下水道的污水排入海里。 来自《现代汉英综合大词典》
• Another municipal waste problem is street runoff into storm sewers. 有关都市废水的另外一个问题是进入雨水沟的街道雨水。 来自英汉非文学 - 环境法 - 环境法

6 overloaded   

a.超载的，超负荷的

参考例句：

• He's overloaded with responsibilities. 他担负的责任过多。
• She has overloaded her schedule with work, study, and family responsibilities. 她的日程表上排满了工作、学习、家务等，使自己负担过重。

7 overflowing   

n. 溢出物,溢流 adj. 充沛的，充满的 动词overflow的现在分词形式

参考例句：

• The stands were overflowing with farm and sideline products. 集市上农副产品非常丰富。
• The milk is overflowing. 牛奶溢出来了。

8 depletion   

n.耗尽，枯竭

参考例句：

• Increased consumption of water has led to rapid depletion of groundwater reserves.用水量的增加导致了地下水贮备迅速枯竭。
• Farmers should rotate crops every season to prevent depletion of the soil.农夫每季应该要轮耕，以免耗尽土壤。

9 killing   

n.巨额利润；突然赚大钱，发大财

参考例句：

• Investors are set to make a killing from the sell-off.投资者准备清仓以便大赚一笔。
• Last week my brother made a killing on Wall Street.上个周我兄弟在华尔街赚了一大笔。

10 marine   

adj.海的；海生的；航海的；海事的；n.水兵

参考例句：

• Marine creatures are those which live in the sea. 海洋生物是生存在海里的生物。
• When the war broke out,he volunteered for the Marine Corps.战争爆发时，他自愿参加了海军陆战队。

11 vessels   

n.血管( vessel的名词复数 )；船；容器；（具有特殊品质或接受特殊品质的）人

参考例句：

• The river is navigable by vessels of up to 90 tons. 90 吨以下的船只可以从这条河通过。 来自《简明英汉词典》
• All modern vessels of any size are fitted with radar installations. 所有现代化船只都有雷达装置。 来自《现代汉英综合大词典》

12 vitality   

n.活力，生命力，效力

参考例句：

• He came back from his holiday bursting with vitality and good health.他度假归来之后，身强体壮，充满活力。
• He is an ambitious young man full of enthusiasm and vitality.他是个充满热情与活力的有远大抱负的青年。

13 irony   

n.反语，冷嘲；具有讽刺意味的事，嘲弄

参考例句：

• She said to him with slight irony.她略带嘲讽地对他说。
• In her voice we could sense a certain tinge of irony.从她的声音里我们可以感到某种讥讽的意味。

14 defense   

n.防御，保卫；[pl.]防务工事；辩护，答辩

参考例句：

• The accused has the right to defense.被告人有权获得辩护。
• The war has impacted the area with military and defense workers.战争使那个地区挤满了军队和防御工程人员。

15 mechanism   

n.机械装置；机构，结构

参考例句：

• The bones and muscles are parts of the mechanism of the body.骨骼和肌肉是人体的组成部件。
• The mechanism of the machine is very complicated.这台机器的结构是非常复杂的。

16 renowned   

adj.著名的，有名望的，声誉鹊起的

参考例句：

• He is one of the world's renowned writers.他是世界上知名的作家之一。
• She is renowned for her advocacy of human rights.她以提倡人权而闻名。

17 haven   

n.安全的地方，避难所，庇护所

参考例句：

• It's a real haven at the end of a busy working day.忙碌了一整天后，这真是一个安乐窝。
• The school library is a little haven of peace and quiet.学校的图书馆是一个和平且安静的小避风港。