medullary ray是什么意思 medullary ray怎么读
medullary ray的英文翻译是什么意思，词典释义与在线翻译
Noun:- a sheet of vascular tissue separating the vascular bundles
medullary ray的用法和样例
- Collateral or bicollateral vascular bundle, developmental pith and medullary ray are obvious.
髓部发达，髓射线明显。
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