| 单词 | protostele | 
| 释义 | Word Frequency protostele(ˈprəʊtəˌstiːl, -ˌstiːlɪ) noun  botany a simple type of stele with a central core of xylem surrounded by a cylinder of phloem: occurs in most roots and the stems of ferns, etc Derived forms protostelic (ˌprotoˈstelic) adjective  | 
	
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