【英语时差8,16】果蝇的学习能力

 Fruit Fly Learning You might think those pesky little fruit flies gathering¹ around your fresh produce every summer are too stupid to know a banana from a pear. They’re barely large enough to see. They certainly can’t have that much brain power, can they? Well, fruit flies will never be rocket scientists, but researchers have discovered that they can learn from each other. Fruit flies, known as Drosophila melanogaster, grow from eggs to adults in about a week. Within the first forty-eight hours after emergence² into adulthood³, female fruit flies mate and start laying eggs. Fruit flies life spans are short, lasting⁴ only thirty to sixty days, and the survival of their eggs depends upon where they are laid. So how do females decide where to lay them? Many insect species are pre-wired genetically⁵ to lay eggs on a particular plant or group of plants. Fruit flies may be pre-wired to some extent, but scientists have found that novice⁶ females, those with no egg laying experience, learn from other females. When novices⁷ observed experienced females laying eggs on a specific fruit, they preferred that fruit type later when laying their own eggs. Observing non-laying virgin⁸ females, or being exposed to an aggregation⁹ pheromone used to attract individuals to a location, did not create the same preference. Now that scientists know fruit flies are capable of social learning, they are excited about possible research into the evolution and neurogenetics of their learning ability. Fruit flies share many genes¹⁰ with humans, and future research may unlock some mysteries of human learning as well. Unfortunately, none of this will probably keep those little flies off your fruit in summer.

1 gathering   

n.集会，聚会，聚集

参考例句：

• He called on Mr. White to speak at the gathering.他请怀特先生在集会上讲话。
• He is on the wing gathering material for his novels.他正忙于为他的小说收集资料。

2 emergence   

n.浮现，显现，出现，（植物）突出体

参考例句：

• The last decade saw the emergence of a dynamic economy.最近10年见证了经济增长的姿态。
• Language emerges and develops with the emergence and development of society.语言是随着社会的产生而产生，随着社会的发展而发展的。

3 adulthood   

n.成年，成人期

参考例句：

• Some infantile actions survive into adulthood.某些婴儿期的行为一直保持到成年期。
• Few people nowadays are able to maintain friendships into adulthood.如今很少有人能将友谊维持到成年。

4 lasting   

adj.永久的，永恒的；vbl.持续，维持

参考例句：

• The lasting war debased the value of the dollar.持久的战争使美元贬值。
• We hope for a lasting settlement of all these troubles.我们希望这些纠纷能获得永久的解决。

5 genetically   

adv.遗传上

参考例句：

• All the bees in the colony are genetically related. 同一群体的蜜蜂都有亲缘关系。
• Genetically modified foods have already arrived on American dinner tables. 经基因改造加工过的食物已端上了美国人的餐桌。 来自英汉非文学 - 生命科学 - 基因与食物

6 novice   

adj.新手的，生手的

参考例句：

• As a novice writer,this is something I'm interested in.作为初涉写作的人，我对此很感兴趣。
• She realized that she was a novice.她知道自己初出茅庐。

7 novices   

n.新手( novice的名词复数 )；初学修士（或修女）；（修会等的）初学生；尚未赢过大赛的赛马

参考例句：

• The Russians are such novices in Africa. 在非洲的俄国人简直都是些毫无经验的生手。 来自辞典例句
• Where the primary track all novices, screams everywhere, ha ha good terror. 那里的初级道上全是生手，到处都是尖叫声，哈哈好恐怖的。 来自互联网

8 virgin   

n.处女，未婚女子；adj.未经使用的；未经开发的

参考例句：

• Have you ever been to a virgin forest?你去过原始森林吗？
• There are vast expanses of virgin land in the remote regions.在边远地区有大片大片未开垦的土地。

9 aggregation   

n.聚合，组合；凝聚

参考例句：

• A high polymer is a very large aggregation of units.一个高聚物是许多单元的非常大的组合。
• Moreover,aggregation influences the outcome of chemical disinfection of viruses.此外，聚集作用还会影响化学消毒的效果。

10 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