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。

And then arches are actually very rare.

而弓形其实非常罕见。

Not so when researchers recently injected mice with Toxoplasma gondii.

研究人员最近给小白鼠注射弓形虫却没符合惯例。

" And a good one, " said the picador and walked out of the dining room, gray-jacketed, trim-waisted, bow-legged, in tight breeches over his high-heeled cattlemen's boots that clicked on the floor as he swaggered quite steadily, smiling to himself.

“而且是个出色的，”骑马长矛手说，然后便走出了餐室。他身穿灰色茄克衫、紧身马裤，腰身很漂亮，双腿呈弓形，足登一双牧牛人的高跟皮靴。当他一边微笑着，一边相当稳健地走出去的时候，这双皮靴在地板上发出卡嗒卡嗒的声响。

You can even see how the collision has shaped the gas, forming a bow shock in one cluster like the waves of water created by a rapidly moving boat.

你甚至可以看到碰是如何形成气体的，在一个星团中形成弓形冲击，就像快速移动的船只所产生的水。

Now this research is still very much in its early stages, but it looks like toxoplasma could potentially be engineered to deliver therapeutic proteins to the brain.

这项研究仍处于早期阶段，但看起来弓形虫有可能被用来向脑输送治疗性蛋白质。

Wolves infected with toxoplasma are more likely to wander away from their former pack to find a new one and are more risk-taking, more bold.

感染弓形虫的狼更有可能离开原来的狼群去寻找新的狼群，而且更冒险，更胆。

Rickets-specific symptoms include, thin, soft skull bones, which is called craniotabes, delay in the closure of fontanelles, and bow legs, also known as genu varum.

佝偻病的特异性症状包括颅骨变薄变软，即颅骨软化，前囟迟闭，以及O型腿，又叫弓形腿。

For example, Turing Pharmaceuticals' drug Daraprim, used to treat the parasitic infection toxoplasmosis that affects roughly 200,000 people a year, entered the market in 1953.

例如，图灵制药公司的药物达拉匹林于1953年进入市场。达拉匹林曾用于治疗寄生虫感染弓形虫病，该病每年影响约20万人。

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。

Toxoplasmosis, which is not very harmful to other felids, has a very high fatality rate among young Pallas' cats, Qi said.

齐说，弓形虫病对其他动物危害不，但在兔狲幼猫中死亡率非常高。

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

事实上，这是自然界中最稳固的弓形之一，如今我们仍然常常用到。

And the hoops were made by soldiers, who turned over and stood on their hands and feet.

弓形小球门由士兵组成，他们转过身去，红鹤腿着地站着。

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。

" The story about Toxoplasma gondii manipulating the behavior of its host is simply fascinating."

“弓形虫操纵宿主行为的故事简直令人着迷。”

Most people have probably heard of Toxoplasma gondii, the parasitic protozoan that causes toxoplasmosis.

多数人可能都听说过刚地弓形虫，这种寄生性原生动物会引起弓形虫病。

Backyard surveys have found up to 400 Toxo oocysts per square foot. They can survive for more than a year and a half in the soil.

对后院的调查发现，每平方英尺的土地上约有400个弓形虫卵囊。它们能在土壤中存活一年半的时间。

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系统中繁殖的弓形虫和老鼠身上。

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。

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。