In roots it may also be called plerome.
原成层在根中也被中柱原。
Protoxylem The PRIMARY XYLEM elements that are formed from the procambium first.
初生木质部的成分，最早由原成层成。
Acropetal differentiation of the cambium layer continues as the primary root elongates.
成层的向顶分化像初生根伸长一样在继续进行。
Interfascicular cambium A single layer of actively dividing cells between the vascular bundles in stems.
成层是位于茎的维管的具有旺盛分裂能力的一层细胞。
Bark The outermost tissue of the stem and roots in woody plants, on the outside of the phellogen (cork cambium).
木本植物中的茎或根中木栓成层外方的全部组织，树皮。
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Is cambium and pith the same thing?
层和髓是同一种东西吗？
But asteroids are so small and light, they never quite formed layers, and those rare, heavy elements are more accessible.
但是小行星又小又轻，它们从来没有完全层，而那些稀有的重元素更容易获得。
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.
它破坏了一点层，它，树幸存下来并继续生长，它开始在伤疤周围卷曲。
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.
因此沉积物被运沉积下来，随着时间的推移在地球表面层。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。
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划词翻译
详细解释
成层在根中也被
中柱原。
线杂志 
层
层
它，树幸存下来并继续生长，它开始在伤疤周围卷曲。
沉积下来，随着时间的推移在地球表面
