英语听力文摘 English Digest 602、抑郁可能对进化有好处

 　　Feeling down? You’re not alone. If depression seems pretty common, it is. One in every ten adults suffers from depression. And that’s what has scientists puzzled. If depression is a detrimental¹ condition, why is it so rampant² in the population?

 

　　Some scientists think they may have the answer. Depression may have an evolutionary³ benefit. It may improve one’s chances of fighting off infection.

 

　　Scientists have known that depressed⁴ people display an immunoactive condition known as inflammation, even when they are not infected. For several years they have been finding that genes⁵ linked to depression also affect the function of the immune system. Stress, which can lead to depression, also modifies the immune system. These findings suggested that depression was somehow linked to the body’s ability to fight disease.

 

　　Some scientists now propose that depression might have had an evolutionary advantage in the days before modern medicine and antibiotics⁶. Infection was a major cause of death in early human history. Surviving those infections determined⁷ which genes were passed to the next generation.

　　They suspect that depression helped people, especially children, survive infection. Fatigue⁸ leads to inactivity and less social contact which helps keep infection from spreading. Shunning⁹ food helps avoid food sharing which can also spread infection. Sleeplessness¹⁰, which is associated with both depression and immune system activation¹¹, may have been a mechanism¹² to keep a person alert to fight off predators¹³ after injury.

 

　　If scientists are correct about this link, it could lead to new treatments for depression. They are interested in drugs that treat conditions where the immune system attacks the person’s own body, known as auto¹⁴ immune diseases. It is possible that medications known to treat auto immune disease may be successful in treating depression also.

1 detrimental   

adj.损害的，造成伤害的

参考例句：

• We know that heat treatment is detrimental to milk.我们知道加热对牛奶是不利的。
• He wouldn't accept that smoking was detrimental to health.他不相信吸烟有害健康。

2 rampant   

adj.(植物)蔓生的；狂暴的，无约束的

参考例句：

• Sickness was rampant in the area.该地区疾病蔓延。
• You cannot allow children to rampant through the museum.你不能任由小孩子在博物馆里乱跑。

3 evolutionary   

adj.进化的；演化的，演变的；[生]进化论的

参考例句：

• Life has its own evolutionary process.生命有其自身的进化过程。
• These are fascinating questions to be resolved by the evolutionary studies of plants.这些十分吸引人的问题将在研究植物进化过程中得以解决。

4 depressed   

adj.沮丧的，抑郁的，不景气的，萧条的

参考例句：

• When he was depressed,he felt utterly divorced from reality.他心情沮丧时就感到完全脱离了现实。
• His mother was depressed by the sad news.这个坏消息使他的母亲意志消沉。

5 genes   

n.基因( gene的名词复数 )

参考例句：

• You have good genes from your parents, so you should live a long time. 你从父母那儿获得优良的基因，所以能够活得很长。 来自《简明英汉词典》
• Differences will help to reveal the functions of the genes. 它们间的差异将会帮助我们揭开基因多种功能。 来自英汉非文学 - 生命科学 - 生物技术的世纪

6 antibiotics   

n.（用作复数）抗生素；（用作单数）抗生物质的研究；抗生素，抗菌素( antibiotic的名词复数 )

参考例句：

• the discovery of antibiotics in the 20th century 20世纪抗生素的发现
• The doctor gave me a prescription for antibiotics. 医生给我开了抗生素。

7 determined   

adj.坚定的；有决心的

参考例句：

• I have determined on going to Tibet after graduation.我已决定毕业后去西藏。
• He determined to view the rooms behind the office.他决定查看一下办公室后面的房间。

8 fatigue   

n.疲劳，劳累

参考例句：

• The old lady can't bear the fatigue of a long journey.这位老妇人不能忍受长途旅行的疲劳。
• I have got over my weakness and fatigue.我已从虚弱和疲劳中恢复过来了。

9 shunning   

v.避开，回避，避免( shun的现在分词 )

参考例句：

• My flight was more a shunning of external and internal dangers. 我的出走是要避开各种外在的和内在的威胁。 来自辞典例句
• That book Yeh-yeh gave me-"On Filial Piety and the Shunning of Lewdness"-was still on the table. 我坐下来，祖父给我的那本《刘芷唐先生教孝戒淫浅训》还在桌子上。 来自汉英文学 - 家（1-26） - 家（1-26）

10 sleeplessness   

n.失眠，警觉

参考例句：

• Modern pharmacy has solved the problem of sleeplessness. 现代制药学已经解决了失眠问题。 来自《简明英汉词典》
• The doctors were puzzled by this strange continuous sleeplessness. 医生们对他的奇异的不眠感到疑惑。 来自英语晨读30分（高三）

11 activation   

n. 激活，催化作用

参考例句：

• A computer controls the activation of an air bag.电脑控制着气囊的启动。

12 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。

13 predators   

n.食肉动物( predator的名词复数 )；奴役他人者（尤指在财务或性关系方面）

参考例句：

• birds and their earthbound predators 鸟和地面上捕食它们的动物
• The eyes of predators are highly sensitive to the slightest movement. 捕食性动物的眼睛能感觉到最细小的动静。 来自《简明英汉词典》

14 auto   

n.(=automobile)(口语)汽车

参考例句：

• Don't park your auto here.别把你的汽车停在这儿。
• The auto industry has brought many people to Detroit.汽车工业把许多人吸引到了底特律。