And there are two main types of cells that make up that vascular tissue: xylem and phloem.

构成维管细胞主要有两种：木质部和韧皮部。

And scattered throughout the ground tissue are the vascular tissue bundles, or veins, which look weirdly like they're screaming.

分散在地中是维管束，或静脉，们看起来很奇怪，就像在尖叫样。

Now step with me into this giant as we peer through the bark, the vascular system of the tree reveals itself.

现在请和我起进入这棵巨树中，我们透过树皮窥视，树木维管系统展现在我们眼前。

It's got a similar vibe to the stem, except its vascular tissue is clustered in the center of the root.

和茎有相似感觉——除了维管聚集在根中心。

Although many of the early seedless vascular plants have gone extinct, you can still find some of them growing today.

虽然许多早期无籽维管植物已经灭绝了，但你仍然可以发现们中些在今天生长。

Please welcome: dermal tissue, the plant's skin; vascular tissue, the plant's veins; and ground tissue — everything in between.

表皮，植物皮肤；维管，植物脉络；还有基本——介于两者之切。

But, they were the first plants to form true roots, stems, and leaves that contain vascular tissue, so they're considered the first vascular plants.

但是，们是第批形成真正根、茎和含有维管叶子植物，所以们被认为是第批维管植物。

By this time, many plants had developed  a kind of vascular tissue called " xylem." This helped move water from the  bottom to the top of the plant.

到这个时候，许多植物已经发育出种叫做“木质部”维管。这有助于将水从植物底部输送到植物顶部。

OK, so the third and final tissue type is ground tissue, which is everything that isn't dermal or vascular — basically, the meaty bits of the plant.

好，第三种也是最后种类型是基质，也就是除了表皮和维管以外所有东西，基本上就是植物肉质部分。

The three main organs that comprise a plant body are stems, leaves, and roots, and their presence is one of the defining characteristics of a category called vascular plants.

成植物体三个主要器官是茎、叶和根，们存在是维管植物个决定性特征。

The nutrients themselves could come from conventional crops, but Dr Post also has plans to use algae, which grow faster than vascular plants, to provide the necessary amino acids, sugars and fats.

那些营养物质可以从普通农作物中获取，但Post博士计划使用藻类，因为们比那些维管植物长要快，以此提供所需氨基酸、糖类和脂肪。

But lycopods were also the earliest vascular plants, which means they were the first plants to contain xylem, a special tissue that moves water and nutrients from the roots to the leaves.

但石松属也是最早维管植物，这意味着们是最早含有木质部植物，木质部是种特殊， 可以将水分和养分从根部输送到叶子。

Their epidermis, or outermost layer of tissue, produces billions of tiny hairs that absorb water and nutrients, and their vascular tissue transports the nutrients up to the stem and leaves.

们表皮，或最外层，产生了数十亿根微小毛发，这些毛发吸收水分和营养，们维管将营养物质运送到茎和叶。

Having a dominant sporophyte introduced lots of advantages — like, while the spore-making generation of a bryophyte couldn't grow very far off the ground; the sporophytes of seedless vascular plants could grow much taller and larger, with more room for spore-producing organs.

拥有个优势孢子体带来了很多好处——比如，苔藓植物产孢体不能长得离地很远；而无籽维管植物孢子体可以长得更高更大，有更多空容纳产孢器官。