听力文摘：你绝对勒不死苍蝇

Can You Choke a Fly?

你绝对勒不死苍蝇

These dark flies are driving me badly! I wish I could strangle each of every one of them!

这些飞来飞去的黑苍蝇快把我逼疯了！我真想把他们全部勒死！

I'm sorry to say, but that's impossible.

很遗憾，你办不到！

I realize that. I don't mean that I have to strangle all of them. Really, I did happy if I could strangle even just one or two of them.

我知道，要全部都勒死不容易，不过，哪怕勒死那么一两只也好啊！

Impossible!

你还是办不到！

I'm sure. I can just manage to just strangle one if I had some dental¹ flosses or something.

我保证如果有类似牙线的东西，我肯定能勒死一只苍蝇。

I'm sure you couldn't because insects breathe quite differently from us. They don't have a central area like our lungs where they gather oxygen; nor a transport system like our heart, and the blood used to deliver oxygen to all of our cells.

我打赌你做不到。因为昆虫呼吸可不像我们人类的。昆虫既没有肺似的中心区域，可以容纳空气；也没有像心脏似的运输系统，可以通过血液循环，给身体所有细胞供氧。

Nope. Flies, like all insects, breathe through many tiny openings called spiracles. These openings are part of tubes called trachea. Each tube leads to a fluid-filled tracheole, where the oxygendissolves and then diffuses² across the wall of the tracheole and into several of the insect's cells. So there is no central breathing area to block off so that you might strangle a fly.

苍蝇，和所有昆虫一样，通过无数微小的气门来进行呼吸。气门是气管的部分。气管又分支成许多微气管，微气管里充满液体，吸入的氧气溶解于其中，穿透气管管壁扩散到昆虫的无数细胞中。所以， 你没方法让苍蝇窒息。

However, if you wanted to drown a fly, that's another story. The spiracles of most insects can close to keep things like dust out. Therefore, they can hold their breath, so to speak. But if an insect is trapped in water for too long, it will run out of oxygen and eventually drown.

但是，如果你想让苍蝇淹死，又是另外回事了。大多数昆虫紧密气门，防止灰尘进入。这样，它们不得不屏住呼吸，但是如果在水里太长时间，它们会因为缺氧而溺死。

Now, I just have to figure out how to lure³ them all into some water.

那么，现在我只要想法子让苍蝇掉进水里就可以啦！

1 dental   

adj.牙齿的，牙科的

参考例句：

• You can get free dental treatment.你可以得到免费的牙齿治疗。
• I had undergone a major dental operation.我经受了一次牙科大手术。

2 diffuses   

（使光）模糊，漫射，漫散( diffuse的第三人称单数 )； （使）扩散； （使）弥漫； （使）传播

参考例句：

• A gas in solution diffuses from region of greater to one of less concentration. 溶液中的气体由浓度较高的区域向浓度较低的区域扩散。
• The sun diffuses light and heat. 太阳发出光和热。

3 lure   

n.吸引人的东西，诱惑物；vt.引诱，吸引

参考例句：

• Life in big cities is a lure for many country boys.大城市的生活吸引着许多乡下小伙子。
• He couldn't resist the lure of money.他不能抵制金钱的诱惑。