这个词是什么意思？
A plant family of the order Urticales, subclass Hamamelidae, class Magnoliopsida. Members are trees and shrubs of temperate regions that have watery sap and alternate leaves which are lopsided at the base. The flowers lack petals.
中文名称索引；定义为 MeSH 英文原文，尚未逐条译审。MESH:D034401 · MeSH 2026。
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