primary xylem短语¹⁰⁶¹⁰⁰⁺⁵ 基本例句 初生木质部 The process of vessel element's promotion, formation and connection in primary xylem of Antirrhinum majus, a model plant, was observed through micropolariscope and bright-field microscope. 利用偏光显微镜和明场显微镜，首次报道了模式植物金鱼草幼苗初生维管系统木质部导管分子的发育、形成和连接过程。 cnki