The two more distant trees had 2.9 and 2.0 respectively.

另外两棵较远树韧皮部每千汞含量分别为2.9及2.0。

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

位于喷发点树上韧皮部中每千含有9.5汞。

This had similar mercury levels to the phloem.

树皮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，韧皮部胞与木质部胞运输方向相反。

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，木质部负责运输水，韧皮部负责在光合作用后运输糖。

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

构成维管组胞主要有两种：木质部和韧皮部。

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

伴生胞是分散在较大韧皮部胞中小胞。

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，有选择性地在其中沉积，而非在自己不易更新部位沉积。

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 升水，自由流动于韧皮部和木质部管道中。

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，就长在树皮之下，它将光合作用产物输送到树根部。

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。

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，我们会注意到它木质部和韧皮部胞依偎在一起，就像它们在茎中一样。

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在一起形成植物脉络——连接叶子、茎和根地铁地图。

The pith is encircled by a ring of xylem, and xylem is encircled by a ring of phloem… phloem, and pith growth is usually pale in color.

髓被一圈木质部包围，木质部又被一圈韧皮部… … 韧皮部包围，髓生长通常呈浅色。

So the xylem cells are transporting nutrients from the roots to the leaf, and the phloem are taking the freshly made sugar from the leaf to the rest of the plant.

所以木质部胞将营养物质从根输送到叶，韧皮部将新鲜糖从叶输送到植物其他部分。

The xylem cells, which are moving water and nutrients up through the stem, are clumped toward the inside of the bundle, and the phloem, which is transporting sugars down through the plant, is clustered toward the outside.

木质部胞负责将水分和营养物质通过茎部向上输送，它们向束内部聚集，韧皮部负责将糖分向下输送，它们向束外部聚集。