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secondary phloem
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secondary phloem
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理学
〔植物形态与结构〕
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secondary phloem
次生韧皮部
在维管植物的次生生长中,由维管形成层产生的韧皮部组织。包括轴向系统和射线系统。
Biology
secondary phloem
次生韧皮部
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