This had similar mercury levels to the phloem.

树皮汞含量与皮部相近。

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

位于喷发点树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，延伸出管束，木质部负责运，皮部负责在光合作用后运糖。

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。

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

就在皮旁边是树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.

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。

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，就长在树皮之下，它将光合作用产物送到树根部。

So the bark is the phloem.

所以树皮就是皮部。

Part of it is the phloem.

其中一部分是皮部。

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，实际上超过 1000 升，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，皮树液变很稀，类似一样物质，聚集在树底部。

Right, so the phloem, that's bark.

对了，那么皮部，就是树皮。

And the cambium produces phloem and xylem cells.

而形层则生皮部和木质部细胞。

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，我们会注意到它木质部和皮部细胞依偎在一起，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.

木质部和皮部捆绑在一起形植物脉络——连接叶子、茎和根地铁地图。

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.

包含树叶光合作用产生糖分，皮树液很稠，像蜂蜜，沿着植物皮组织向下流动把糖份送到树各个部分。

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送到叶，皮部将新鲜糖从叶送到植物其他部分。