The two more distant trees had 2.9 and 2.0 respectively.

另外两棵较远的树的韧皮部每千克汞含量分别为2.9及2.0。

Phloem from the tree at the eruption site had 9.5 micrograms of the metal per kilogram.

位于喷发点的树上的韧皮部中每千克含有9.5毫克汞。

This had similar mercury levels to the phloem.

树皮的汞含量与韧皮部相近。

Phloem cells, on the other hand, transport stuff mostly in the opposite direction as xylem cells.

另一方面，韧皮部细胞与木质部细胞的运输方向相反。

Through that space stretches the vascular bundle, with xylem to transport water and phloem which transport sugars after photosynthesis.

通过这个空间，延伸出维管束，木质部负运输水，韧皮部负合作用后运输糖。

Right beside the phloem is the tree's other tissue type: the xylem.

就韧皮的旁边是树的另外一种组织叫木质。

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

构成维管组织的细胞主要有两种：木质部和韧皮部。

The companion cells are the little guys scattered throughout the larger phloem cells.

伴生细胞是分散较大韧皮部细胞中的小细胞。

Carbon travels through the phloem into the branches, down the tree trunk and even all the way down to the soil.

碳通过韧皮部传到树枝，沿着树干甚至一路传到土壤中。

Mercury is carried there by the phloem and selectively deposited in it, rather than in the plants' more permanent parts.

汞通过韧皮部被转运到树皮中，有选择性地其中沉积，而非自己不易更新的部位沉积。

Carbon and water, more than 1,000 liters of water, in fact, flow freely through the phloem and xylem tubes carry it along.

碳和水，实际上超过 1000 升的水，自由流动于韧皮部和木质部的管道中。

So the bark is the phloem.

所以树皮就是韧皮部。

Part of it is the phloem.

其中一部分是韧皮部。

By the end of its journey, the phloem sap has thinned into a watery substance, pooling at the base of the tree.

这个旅程的最后，韧皮树液变成很稀，类似水一样的质，聚集树的底部。

A second set of channels, the phloem, found just under a tree's bark, carries the products of photosynthesis to the roots.

第二组通道叫韧皮部，就长树皮之下，它将合作用的产输送到树的根部。

Right, so the phloem, that's bark.

对了，那么韧皮部，就是树皮。

And the cambium produces phloem and xylem cells.

而形成层则生成韧皮部和木质部细胞。

And if we zoom in, we'll notice its xylem and phloem cells snuggled together, just like they were in the stem.

如果我们放大，我们会注意到它的木质部和韧皮部细胞依偎一起，就像它们茎中一样。

Xylem and phloem are bundled together to form the veins of a plant — the subway map that connects the leaves, stem, and roots.

木质部和韧皮部捆绑一起形成植的脉络——连接叶子、茎和根的地铁地图。

Containing the sugars generated in leaves during photosynthesis, phloem sap is thick, like honey, and flows down the plant's phloem tissue to distribute sugar throughout the tree.

包含树叶合作用产生的糖分，韧皮树液很稠，像蜂蜜，沿着植的韧皮组织向下流动把糖份送到树的各个部分。