听力文本
Ever lit a citronella candle to ward off mosquitoes, only to have 'em appear in droves?
Well, believe it or not, you may have actually been attracting the bugs.
Because while high concentrations of those pine-and-lemon-scented chemicals might repel mosquitoes, at low concentrations they lure the bloodsuckers in.
Audrey Odom, who studies mosquitoes at Washington University, calls it the "Chanel hypothesis."
Too much perfume is awful, but a little is pretty nice.
Plants take advantage of that to advertise their nectar—because no, mosquitoes don't live on blood alone.
But here's where things get weird.
Plasmodium—the malaria parasite—also manufactures those alluring odor molecules, called terpenes.
It does so using a chloroplast-like organelle, like the one plants use to capture sunlight.
The malaria parasite's version can't trap light, but it can still manufacture plant perfume.
The study appears in the journal MBio.
The parasites produce these scents in the lab, and mosquitoes are attracted to them.
The only question left for Odom and her colleagues is whether these chemicals also appear in the breath of infected humans.
If they do, she says, the goal is to build a quick breathalyzer test for malaria, instead of the blood test used today—which would attract doctors to a patient in need before the next mosquito comes to bite.

参考译文

有没有试过点燃一支香茅蜡烛驱赶蚊蝇，结果发现招来一大群的经历?
不管你信不信，你实际上可能是在吸引这些蚊虫B4*yp7.Vlj。
原因在于虽然高浓度下散发着菠萝与柠檬复合香味的那些化学制品能够驱散蚊虫，但在低浓度下却适得其反，成为招引这些吸血狂魔的利器UJLC~F2]]vhNSq。

华盛顿大学研究蚊子的专家奥德丽·厄多姆将此归结为“香奈儿假说”nH-%Lw(z%dG#)。
香水喷太多结果会很糟糕，但仅仅一点就会有非常好的效果3lCM&-ss=kkqC*.@en。
某些植物就是利用了这一点来为自己的花蜜进行宣传造势—因为蚊子不单是靠吸血存活09]F|qpa*0.Ob。
但接下来是令人费解的事情7Y818z|rUm#I。
疟原虫，这种疟疾寄生虫也会散发一种名为萜烯的诱人香味分子LWJ]^R@qN0QX。
它是利用一种类似于细胞器的叶绿体达成这一目的，就像植物捕捉阳光一样ZWL]|RP5SWDO5e[*Wczy。
虽然疟疾寄生虫不能捕捉阳光，但它仍可产生植物般发出的香味qkt0L|jiTg;w!)tyF。
这项研究已在《MBio》杂志上发表8h]Vm6Ma!ZJgB[。
寄生虫在实验环境下产生这种气味吸引蚊子%.3~jkAzi*g8gPM。
现在留给厄多姆和她同事们唯一的问题就是受疟疾感染人群的呼吸中是否有这种气味的化学物质W%Fy8L1ht~~KhR23。
如果经证实存在，厄多姆表示她们就要制造一种快速呼吸器替代当今用的验血测验5@[pjpI8GPnci_(4x。在患者被更多蚊子叮咬之前医生就能发现b.oss50_l~+nx。

译文为可可英语翻译，未经授权请勿转载！

重点讲解

1.ward off 避开，挡住

This is just another way to ward off depression.
这也是另一种避免抑郁的方式7nnqN^x0BVmUNbY2y)1W。

Turning down his testosterone level helps ward off that risk.
减少睾丸激素水平则会让其避免那种风险t!rl49fqFdx#。

2.take advantage of 利用

How can you take advantage of their support?
你将如何利用他们支持的优势？

The result is that we seldom take advantage of the opportunities before us.
其结果就是我们很少会抓住眼前的机遇去提升自己YwncGY(@zB-dDs4。