新概念英语第四册Lesson 26 The past life of the earth

Lesson 26
The past life of the earth
地球上的昔日生命

First listen and then answer the following question.
听录音，然后回答以下问题。

What is the main condition for the preservation¹ of the remains² of any living creature?

It is animals and plants which lived in or near water whose remains are most likely to be preserved, for one of the necessary conditions of preservation is quick burial, and it is only in the seas and rivers, and sometimes lakes, where mud and sit have been continuously deposited, that bodies and the can be rapidly covered over and preserved.
But even in the most favourable³ circumstances only a small fraction of the creatures that die are preserved in this way before decay sets in or, even more likely, before scavengers eat them. After all, all living creatures live by feeding on something else, whether it be plant or animal, dead or alive, and it is only by chance that such a fate is avoided. The remains of plants and animals that lived on land are much more rarely preserved, for there is seldom anything to cover them over. When you think of the innumerable birds that one sees flying bout⁵, not to mention the equally numerous small animals like field mice and voles which you do not see, it is very rarely that one comes across a dead body, except, of course, on the roads. They decompose⁶ and are quickly destroyed by the weather or eaten by some other creature.
It is almost always due to some very special circumstances that traces of land animals survive, as by falling into inaccessible⁷ caves, or into an ice crevasse⁸, like the Siberian mammoths, when the whole animal is sometimes preserved, as in a refrigerator. This is what happened to the famous Beresovka mammoth⁹ which was found preserved and in good condition. In his mouth were the remains of fir trees -- the last meal that he had before he fell into the crevasse and broke his back. The mammoth has now just a suburb of Los Angeles. Apparently¹⁰ what happened was that water collected on these tar¹¹ pits, and the bigger animals like the elephants ventured out on to the apparently firm surface to drink, and were promptly¹² bogged¹³ in the tar. And then, when they were dead, the carnivores, like the sabre-toothed cats and the giant wolves, came out to feed and suffered exactly the same fate. There are also endless numbers of birds in the tar as well.
ERROL WHITE The past life of the earth from Discovery

New words and expressions 生词和短语
preservation
n. 保存
silt¹⁴
n. 淤泥
scavenger⁴
n. 食腐动物
vole
n. 野鼠，鼹鼠
decompose
v. 腐烂
inaccessible
adj. 不能到达的
crevasse
n. 缝隙
Siberian
adj.西伯利亚的
palaeontological
adj. 古生物学的
St. Petersburg
n. 圣彼得堡
sabre-toothed
adj. 长着锐利的长牙
venture
v. 冒险
bogged
adj. 陷入泥沼的，陷入要困境的

参考译文
只有生活在水中或水边的动植物尸体最有可能被保存下来，因为保存的必要条件之一是迅速掩埋，所以只有在泥沙不停淤积的海洋和江河里，有时在湖泊里，尸体之类的东西才能被迅速地覆盖而保存下来。
即使是在最有利的环境中，死去的生物中也只有一小部分能在开始腐烂前，或更可能在被食腐动物吃掉之前，被这样保存下来。因为一切生物都是靠吃别的东西来活命的，不管这种东西是植物还是动物，死的还是活的，因此，生物偶尔才能避免被吃掉的命运。曾在陆地上生活过的动植物的遗体被保存下来的更为罕见，因为陆地上几乎没有什么东西覆盖它们。你可以想象出天上有看得见的飞来飞去、数不清的鸟，地上有不显眼的无数的老鼠和田鼠之类的小动物，但是，除非在路上，很少有人遇到这些动物的尸体，因为它们腐败之后很快就被风化掉，或被别的动物吃掉了。
几乎总是由于某些特殊的条件，陆地动物的遗体才被存下来，如掉进难以到达的洞穴，或掉进冰河裂缝里，或者像西伯利亚长毛象那样掉进冰窟中，有时整个动物像被放在冰箱里一样被保存下来，著名的那林索夫卡长毛象就是这样被保存下来的，而且保存得很好。它嘴里还留着冷杉 -- 它掉进冰河裂隙折断脊椎柱之前的最后一顿饭。这头长毛象已被修复，现存于圣彼得堡古生物学博物馆。有的动物掉进天然沥清坑里被保存下来，如在兰桥.拉.布里 -- 现在是洛杉矶的郊区发现的大象、剑齿虎和许多其他动物。显然，事情的经过是这样：沥青坑里积存了水，大象那样的大动物冒险到似乎坚固的水面上去饮水，立即掉进了沥青坑。大象死后，一些食肉动物，如剑齿虎和大灰狼就来吃大象，结果遭到了同样的命运。沥青坑里还有无数只鸟的尸体。

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1 preservation   

n.保护，维护，保存，保留，保持

参考例句：

• The police are responsible for the preservation of law and order.警察负责维持法律与秩序。
• The picture is in an excellent state of preservation.这幅画保存得极为完好。

2 remains   

n.剩余物，残留物；遗体，遗迹

参考例句：

• He ate the remains of food hungrily.他狼吞虎咽地吃剩余的食物。
• The remains of the meal were fed to the dog.残羹剩饭喂狗了。

3 favourable   

adj.赞成的，称赞的，有利的，良好的，顺利的

参考例句：

• The company will lend you money on very favourable terms.这家公司将以非常优惠的条件借钱给你。
• We found that most people are favourable to the idea.我们发现大多数人同意这个意见。

4 scavenger   

n.以腐尸为食的动物，清扫工

参考例句：

• He's just fit for a job as scavenger.他只配当个清道夫。
• He is not a scavenger nor just a moving appetite as some sharks are.它不是食腐动物，也不像有些鲨鱼那样，只知道游来游去满足食欲。

5 bout   

n.侵袭，发作；一次(阵，回)；拳击等比赛

参考例句：

• I was suffering with a bout of nerves.我感到一阵紧张。
• That bout of pneumonia enfeebled her.那次肺炎的发作使她虚弱了。

6 decompose   

vi.分解；vt.（使）腐败，（使）腐烂

参考例句：

• The eggs began to decompose after a day in the sun.鸡蛋在太阳下放了一天后开始变坏。
• Most animals decompose very quickly after death.大多数动物死后很快腐烂。

7 inaccessible   

adj.达不到的，难接近的

参考例句：

• This novel seems to me among the most inaccessible.这本书对我来说是最难懂的小说之一。
• The top of Mount Everest is the most inaccessible place in the world.珠穆朗玛峰是世界上最难到达的地方。

8 crevasse   

n. 裂缝，破口；v.使有裂缝

参考例句：

• The deep crevasse yawned at their feet.他们脚下的冰川有一道深深的裂缝。
• He fell down a crevasse.他从裂缝处摔了下来。

9 mammoth   

n.长毛象；adj.长毛象似的，巨大的

参考例句：

• You can only undertake mammoth changes if the finances are there.资金到位的情况下方可进行重大变革。
• Building the new railroad will be a mammoth job.修建那条新铁路将是一项巨大工程。

10 apparently   

adv.显然地；表面上，似乎

参考例句：

• An apparently blind alley leads suddenly into an open space.山穷水尽，豁然开朗。
• He was apparently much surprised at the news.他对那个消息显然感到十分惊异。

11 tar   

n.柏油，焦油；vt.涂或浇柏油/焦油于

参考例句：

• The roof was covered with tar.屋顶涂抹了一层沥青。
• We use tar to make roads.我们用沥青铺路。

12 promptly   

adv.及时地，敏捷地

参考例句：

• He paid the money back promptly.他立即还了钱。
• She promptly seized the opportunity his absence gave her.她立即抓住了因他不在场给她创造的机会。

13 bogged   

adj.陷于泥沼的v.（使）陷入泥沼， （使）陷入困境( bog的过去式和过去分词 )；妨碍，阻碍

参考例句：

• The professor bogged down in the middle of his speech. 教授的演讲只说了一半便讲不下去了。 来自《现代英汉综合大词典》
• The tractor is bogged down in the mud. 拖拉机陷入了泥沼。 来自《简明英汉词典》

14 silt   

n.淤泥，淤沙，粉砂层，泥沙层；vt.使淤塞；vi.被淤塞

参考例句：

• The lake was almost solid with silt and vegetation.湖里几乎快被淤泥和植物填满了。
• During the annual floods the river deposits its silt on the fields.每年河水泛滥时都会在田野上沉积一层淤泥。