Simple plant cells may have only one or two chloroplasts in them.

简单的胞可能有一个或两个叶。

Finally, let's look at the chloroplast.

最后是叶。

Because this is how chloroplasts — the organelles that do photosynthesis in plant cells — evolved.

因为这就是叶——胞中进行光合作用的胞器——的进化过程。

Over time, that evolved into a chloroplast, the organelle that does photosynthesis.

随着时间的推移，它们进化成叶，也就是进行光合作用的胞器。

Chloroplasts are found only in plant cells and contain chlorophyll.

叶存于胞内，而且含有叶素。

Today, every single plant has cells like this, full of chloroplasts and mitochondria.

今天，每一株都有这样的胞，充满叶和线粒。

Plant cells also contain chloroplasts which are filled with a chemical called chlorophyll.

胞还包含叶，里面充满了一种叫做叶素的化学质。

But these first eukaryotic plants were soon consumed by other animals, which hijacked the precious chloroplast, just like Elysia.

但这些最早的真核很快就被其他动吃掉了，并被劫持了珍贵的叶，就像叶海天牛一样。

It sucks the cell empty and digests most of its contents, but the chloroplasts remain intact.

它将胞吸空，并消耗其大部分质，留下“叶”完好无损。

Tripos is in turn eaten by other mixotrophic algae, providing frequent opportunity for exchange of organelles such as chloroplasts.

角藻又被其他混合营养藻类吞食，为叶等胞器的交换提供频繁的机会。

This makes the chloroplasts able to sustain themselves for longer inside the slug.

这使得叶能够鼻涕虫内维持更长时间。

You won't find chloroplasts in animals — they're more of a plant thing. You wouldn't understand, Blobfish.

你动身上找不到叶——它们更像是的组成部分。你不会明白的，水滴鱼。

Some of these tiny plants were not digested and lived on in the animal cells, eventually giving rise to chloroplasts.

这些微小并无法消化和吸收这些动胞，最终形成了叶。

And cyanobacteria became chloroplasts, the organelles that carry out photosynthesis today.

蓝藻变成了叶，即今天进行光合作用的胞器。

Among these, the chloroplasts are our focus.

其中，叶是我们的重点。

As incredible as this adaptation is, there are more than 70 species of slug that steal chloroplasts from their food.

如此令人难以置信的适应性，竟然有多达 70 多种鼻涕虫从食中窃取叶。

We call this kleptoplasty." Klepto" , as in to steal, " plasty" as in chloroplast, right?

我们称这种 kleptoplasty 为“Klepto”，就像偷窃一样，“plasty”就像叶中一样，对吧？

Chloroplasts need things that the algae provide to themthat animals shouldn't be able to do.

叶需要藻类为它们提供的动无法提供的东西。

Within each chloroplast are molecules of chlorophyll, the pigment responsible for the lush green color of plants.

每个叶内都有叶素分子，叶素是呈现茂盛色的色素。

Taking a chloroplast and sticking inside of a cellis not enough to become photosynthetic.

获取叶并粘胞内部不足以进行光合作用。