The reason is a microscopic organism called Toxoplasma gondii.

原因在于一种叫做刚地弓形虫的微生物。

Definitely behaviour that is beneficial to toxoplasma, but absolutely not for the rodent.

绝对是有益于弓形虫的行为，但绝对不是啮齿动物。

That's because some cats carry a parasite called toxoplasmosis and it can cause birth defects.

这是因为一些猫携带一种叫做弓形虫的寄生虫，它可能会导致胎儿畸形。

Right whales have round bodies with arching rostrums, V-shaped blowholes and dark grey or black skin.

露脊鲸有圆形的身体，弓形的吻部，V 形的喷气孔和深灰色或黑色的皮肤。

A similar process happens with toxoplasma and mice which breeds in the digestive system of cats.

类似的过程发生在猫的消化统繁殖的弓形虫和老鼠身上。

Rodents that get infected with toxoplasmosis actually makes these rodents attracted to cat urine.

感染弓形虫病的啮齿动物实际上会被猫尿所吸引。

In fact it's one of the most stable arches in nature, so sound that we still use it today.

事实上，这是自稳固的弓形之一，如今我们仍常常用到。

In the United States, it's less ubiquitous and we don't find that there's a need to test for it.

在美国，弓形虫的普遍性较低，因此我们认为没有必要进行检测。

We're talking about toxoplasmosis, a disease caused by Toxoplasma gondii.

我们正在讨论的是由刚地弓形虫引起的弓形虫病。

Infected rodents are more reckless and have slower reaction times.

感染了弓形虫的啮齿动物会变得更加鲁莽，反应时间也会变慢。

She came across a familiar looking floor plan in a book about the bow house.

她在一本关于弓形屋的书发现了一个看起来很熟悉的平面图。

So I wanted to make a bowed lyre with a deeper sound.

所以我想制作一把音色更深的弓形里拉琴。

Rather, it's because this is a perfectly--this is the adaptive strategy of the toxoplasmosis virus.

相反， 这是弓形虫病毒的完善适应策略。

It is actually fairly rare in the US for women to come into contact with toxoplasmosis.

瑞利：实际上，在美国，女性接触弓形虫病的情况相当罕见。

" Oh, Dodo, " said Celia, " will you not have the bow-windowed room up-stairs" ?

“哦，多多，”西莉亚说，“你不要楼上那间带弓形窗的房间吗？”

If you are a rat and you have toxoplasmosis, you are perfectly healthy except for one thing.

如果你是只患有弓形虫病的老鼠，除了一件事外， 你是健康的。

Smaller bows may be seen in the gorge on the plateau between the Upper and Lower Falls.

在上瀑布和下瀑布之间的高原峡谷可以看到较小的弓形。

For example, mice infected with Toxoplasma were quicker to check out the far reaches of an elevated maze than their uninfected comrades.

例如，相比未感染老鼠，感染弓形虫的老鼠会更快地检查遥远高处的迷宫。

She turns, kneels, and all I can see now is her back and the thin bowed shoulders.

她转过身来，跪下，我现在只能看到她的背和瘦弱的弓形肩膀。

Now, but wait. If animals and humans evolved to prevent susceptibility to toxoplasma, why did DD get it?

等等，回过头来，如果动物和人会演化出抵抗弓形虫的能，那为什麽DD会发病呢？