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

简单植物细胞可能仅有一个或两个绿体。

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

因为这就是绿体——植物细胞中进行光合作用细胞器——进化过程。

Finally, let's look at the chloroplast.

最后是绿体。

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

随着时间推移，它们进化成绿体，也就是进行光合作用细胞器。

Chloroplasts are found only in plant cells and contain chlorophyll.

绿体仅存于植物细胞内，而且含有绿素。

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

今天，每一株植物都有这样细胞，充满绿体和线粒体。

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

植物细胞还包含绿体，里面充满了一种叫做绿素化物质。

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

但这些最早真核植物很快就被其他动物吃掉了，并被劫持了珍绿体，就像绿海天牛一样。

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

它将细胞吸空，并消耗其大部分物质，留下“绿体”完好无损。

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

你动物身上找不到绿体——它们更像是植物组成部分。你不会明白，水滴鱼。

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，为绿体等细胞器交换提供频繁机会。

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

这使得绿体能够鼻涕虫体内维持更长时间。

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

这些微小植物并无法消化和吸收这些动物细胞，最终形成了绿体。

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

蓝藻变成了绿体，即今天进行光合作用细胞器。

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

如此令人难以置信适应性，竟然有多达 70 多种鼻涕虫从食物中窃取绿体。

Among these, the chloroplasts are our focus.

其中，绿体是我们重点。

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”就像绿体中一样，对吧？

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

绿体需要藻类为它们提供动物无法提供东西。

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

每个绿体内都有绿素分子，绿素是植物呈现茂盛绿色色素。

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

获取绿体并粘细胞内部不足以进行光合作用。