The only cells it really infects are what we call respiratory epithelial cells, a one-cell layer of cells that kind of protect the breathing tubes and the lungs, all the way down to the bottom, where we have air sacs.

唯正受到感染的细胞我们所说的呼吸上皮细胞，保护呼吸管和肺的单细胞层，直到管道底部有气囊的地方。

Candida is a type of fungi, a single celled member of the yeast family.

念珠菌菌，酵母家族的单细胞成员。

It's even thought that fungi and animals may share a similar single-celled ancestor.

甚至于认为菌和动有相似的单细胞类祖先。

From the very first cells, to you watching this now.

从最最原初的那个单细胞开始，到现在观看这个视频的你。

Long ago, Earth's oceans were filled with purple single-celled organisms called archaea.

很久以前，地球的海洋里满单细胞的紫色生，叫做古生菌。

Bacteria are single-celled, living organisms that can exist and perform life functions on their own.

细菌单细胞的活生体，可以独立存在并执行生命功能。

So a bigger single cell can't catch enough stuff to feed all its volume.

所以个更大的单细胞无法获取足够的东西来养活它所有的体积。

Life on Earth started with single-celled bacteria about 4 billion years ago.

地球上的生命始于大约40亿年前的单细胞细菌。

Dinoflagellates are one of the biggest single-celled organisms known to man.

甲类已知的最大的单细胞生之。

But the team did see single-celled organisms called ciliates in the sick urchins.

但该调查小组确实在患病的海胆中发现了名为纤毛虫的单细胞生。

Yet like the mindless single-cell organisms from which they have evolved(and like the dullest task-accomplishing machines), each is able to secure the energy and raw materials it needs to survive in the competitive environment of the brain.

然而，就像它们从中进化而来的、没有思维能力的单细胞器官样，这些神经细胞中的每个都具备获取所需的能量和原料的能力，这能力确保它们能在互相竞争的大脑环境中生存下去。

For 2 billion years, all organisms on Earth are unicellular, and they likely lived in the oceans, shielded from the hard ultraviolet light of the sun but then something remarkable happened, Photosynthesis.

20亿年以来，地球上的所有生都单细胞的，它们很可能生活在海洋中，不受太阳紫外线的照射，但随后发生了件非同寻常的事情，就光合作用的产生。

Life evolved and diversified but most of it consisted of tiny, single-celled organisms until, about one billion years ago, the first many-celled organisms appeared.

生命进化并开始多样化，但其中大部分由微小的单细胞生组成，直到大约十亿年前，第批多细胞生出现。

By 2.8 billion years, Earth's average surface temperature will have dramatically increased to 149 degrees celsius which means that even simple single-celled organisms on the planet will have completely died out.

到 28 亿年后，地球的平均表面温度将急剧上升到 149 摄氏度，这意味着即使地球上的简单单细胞生也将完全灭绝。

And so we think that life would have experimented with this idea of going from being very simple single cell organisms to more complex life forms at least twice.

因此我们认为，生命至少有两次尝试从非常简单的单细胞生体进化到更复杂的生命形式。

This is already affecting relations between corals and the single-celled algae with which they live symbiotically, and which give them their colour.

这已经影响到珊瑚与它们共生的单细胞类之间的关系，而单细胞类赋予了珊瑚颜色。

Mosses absorb water and nutrients from their one-celled leaves, which are uniquely designed to hold water up to 30 times their own weight.

苔藓从它们的单细胞叶子中吸收水分和营养质，这些单细胞叶子被别出心裁地设计成可以留住相当于自身重量 30 倍的水分。

Every living thing on Earth is made of cells, from the smallest one-celled bacteria, to the giant blue whale to you.

地球上所有生都由细胞组成的，从最小的单细胞菌，到巨大的蓝鲸然后到你。

The pink color comes from tiny single-celled critters called foraminifera that have red shells that tint the sand a pinkish color.

粉色来自微小的单细胞小动，名字孔虫，它们有红色的贝壳，使沙子呈粉红色。

It's not like botanists were around over a billion years ago when that humble, hungry, single-celled organism stumbled upon that cyanobacterium.

十多亿年前，当那个卑微、饥饿的单细胞生偶然发现蓝时，植学家们并不在场。