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

伴生细胞是分散在较大皮部细胞中小细胞。

This had similar mercury levels to the phloem.

皮汞含量与皮部相近。

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

就在皮旁边是另外一种组织叫木质。

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

位于喷发上皮部中每千克含有9.5毫克汞。

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，皮部负责在光合作用后运输糖。

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

汞通过皮部被转运到皮中，有选择性地在其中沉，在自己不易更新部位沉。

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

构成维管组织细胞主要有两种：木质部和皮部。

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

碳通过皮部传到枝，沿着干甚至一路传到土壤中。

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

第二组通道叫皮部，就长在皮之下，它将光合作用产物输送到根部。

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

皮部旁边是另一种组织类型：木质部。

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皮部细胞依偎在一起，就像它们在茎中一样。

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，自由流动于皮部和木质部管道中。

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

这个旅程最后，皮液变成很稀，类似水一样物质，聚集在底部。

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.

包含叶光合作用产生糖分，皮液很稠，像蜂蜜，沿着植物皮组织向下流动把糖份送到各个部分。

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，木质部又被一圈皮部… … 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.

所以木质部细胞将营养物质从根输送到叶，皮部将新鲜糖从叶输送到植物其他部分。

Here at the tree's base, there are more of these particles in one tissue than the other, so the water from the phloem sap is absorbed into the xylem to correct the balance.

在根部，这些组织里微粒分布不均匀，因此，皮液中水分被吸收到木质中，来调节平衡。

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.

木质部细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，皮部负责将糖分向下输送，它们向束外部聚集。

The ability to perceive the world through the eyes and ears of other beings, through the phloem and xylem of trees, even reconnects us, humans, to the fantasticand richly diverse network of organisms that make up our shared Earth.

通过其他生物眼睛和耳朵、木皮部和木质部来感知世界能力，甚至将我们人类与构成我们共同地球奇妙丰富多样生物体网络重新连接起来。