Protoxylem The PRIMARY XYLEM elements that are formed from the procambium first.
初生木质部的成分，最早由原形成层形成。
In roots it may also be called plerome.
原形成层在根中称为中柱原。
Interfascicular cambium A single layer of actively dividing cells between the vascular bundles in stems.
间形成层是的维管间的具有旺盛分裂能力的一层细胞。
Acropetal differentiation of the cambium layer continues as the primary root elongates.
形成层的向顶分化像初生根伸长一样在继续进行。
Bark The outermost tissue of the stem and roots in woody plants, on the outside of the phellogen (cork cambium).
木本植物中的或根中木栓形成层外方的全部组织，称为树皮。
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It killed a little bit of the cambium and then it, the tree survived and kept growing and it starts to curl around that scar.
它破坏了一点形，然它，树幸存下来并继续生长，它开始在伤疤周围卷曲。
Is cambium and pith the same thing?
形髓是同一种东西吗？
So sediment is transported and then deposited and it forms layers on the Earth ’ s surface over time. We examine these layers to learn about different geologic time periods including when they began and ended.
因此沉积物被运输然沉积下来，随着时间的推移在地球表面形。我们检查以了解不同的地质时期，包括它们开始结束的时间。
Your heartwood is gonna be older, obviously, because you know how you can tell a tree by the rings, those inner rings that we talked about, the xylem.
显然，心材会显得更老，是显而易见的， 因为你了解通过年轮来判断一棵树的年龄，就是我们之前讨论过的那内部年轮，即木质部。 对吧，当形不断生更多的木质部细胞时， 它们会位于心材的外部。
And the cambium produces phloem and xylem cells.
而形则生韧皮部木质部细胞。
Right, and as the cambium is creating more xylem cells, they're going on the outside of the heartwood.
是的， 随着形不断产生更多的木质部细胞，细胞会分布在心材的外部。
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划词翻译
详细解释
称为中柱原。
间
的维管
它，树幸存下来并继续生长，它开始在伤疤周围卷曲。
髓是同一种东西吗？
沉积下来，随着时间的推移在地球表面
