The reason is a microscopic organism called Toxoplasma gondii.

原因在于一种叫做刚地弓微生物。

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

露脊鲸有圆身体，弓吻，V 喷气孔和深灰色或黑色皮肤。

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寄生，它可能会导致胎儿畸。

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

绝对是有益于弓行为，但绝对不是啮齿动物。

These creatures had grasping hands, arched backs, and thick muscular tails.

这些生物有紧握手、弓背和粗壮肌肉尾巴。

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

感染弓病啮齿动物实际上会被猫尿所吸引。

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，弓普遍性较低，因此我们认为没有必要进行检测。

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

类似过程发生在猫消化系统中繁殖弓和老鼠身上。

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

事实上，这是自界中最稳固弓之一，如今我们仍用到。

Billy advanced and drew away the drapery which screened the alcove of the bow window.

比利上前拉开遮住弓窗壁龛窗帘。

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

我们说是弓病，一种由弓引起疾病。

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

相反， 这是弓病毒完善适应策略。

" 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窗房间吗？”

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

莱利：在美国，女性接触弓病情况实际上相当罕见。

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高原峡谷中可以看到较小弓。

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能力，那为什麽DD会发病呢？

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

如果你是只患有弓病老鼠，除了一件事外， 你是健康。

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

她转过身来，跪下，我现在只能看到她背和瘦弱弓肩膀。

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，感染弓老鼠会更快地检查遥远高处迷宫。

So is toxo manipulating our brains as an evolutionary strategy to get predatory cats to eat us?

那么，弓操纵我们大脑是否是一种让掠食性猫科动物吃掉我们进化策略？