以下为句子列表：
英文: In the primary structure of root, the primary xylem is diarch and the development of both the primary xylem and the primary phloem is exarch.
中文: 在根的初生结构中，其初生木质部为二原型，木质部及韧皮部的发育均为外始式。
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英文: A diarch or triarchsiphonostele with exarch primary xylem was found at lower cotyledonary node zone (CNZ).
中文: 果表明:银杏幼苗的轴向器官以子叶节区下部的初生维管结构先建立,其中柱类型是外始式二原型或三原型管状中柱;
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英文: In diarch and tetrarch roots the primodia of the lateral root can be initiated from the pericycle situated opposite adjacent protoxylem poles, but it can also be initiated from the pericycle situated between the protoxylem and the protophloem strands.
中文: 在原型和原型的根中,发现侧根正对着原生木质部的位置,也有在原生木质部和原生韧皮部之间的部位,由中柱鞘细胞脱分化再分化而成。
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英文: The primary xylem of root (seminal root) his of diarch and that of adventitious root is of triarch.
中文: 初生根原型,不定根 原型。
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英文: The stele withpith in middle part of CNZ was mesarch and diarch siphonostele.
中文: 中部出现具髓的中始式二原型管状中柱阶段;
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