Protoxylem The PRIMARY XYLEM elements that are formed from the procambium first.
初生木质部分，最早由层。
In roots it may also be called plerome.
层在根中也被可称为中柱。
Interfascicular cambium A single layer of actively dividing cells between the vascular bundles in stems.
间层是位于茎维管间有旺盛分裂能力一层细胞。
Acropetal differentiation of the cambium layer continues as the primary root elongates.
层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).
木本植物中茎或根中木栓层外方全部组织，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.
它破坏了一点成层，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?
成层和髓是同一种东西？
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成层。我们检查这些层以了解不同的地质时期，包括它们开始和结束的时间。
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，这是显而易见的， 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些内部年轮，即木质部。 对吧，当成层不断生成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.
而成层则生成韧皮部和木质部细胞。
Right, and as the cambium is creating more xylem cells, they're going on the outside of the heartwood.
是的， 随着成层不断产生更多的木质部细胞，这些细胞会分布在心材的外部。
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划词翻译
详细解释
分，最早由
托福突破口 
间
有旺盛分裂能力
它，树幸存下来并继续生长，它开始在伤疤周围卷曲。
成层
？
沉积下来，随着时间的推移在地球
