这个词是什么意思？
Expanded structures, usually green, of vascular plants, characteristically consisting of a bladelike expansion attached to a stem, and functioning as the principal organ of photosynthesis and transpiration. (American Heritage Dictionary, 2d ed)
中文名称索引；定义为 MeSH 英文原文，尚未逐条译审。MESH:D018515 · MeSH 2026。
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