这个词是什么意思？
The region of the stem beneath the stalks of the seed leaves (cotyledons) and directly above the young root of the embryo plant. It grows rapidly in seedlings showing epigeal germination and lifts the cotyledons above the soil surface. In this region (the transition zone) the arrangement of vascular bundles in the root changes to that of the stem. (From Concise Dictionary of Biology, 1990)
中文名称索引；定义为 MeSH 英文原文，尚未逐条译审。MESH:D018546 · MeSH 2026。
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