conducting bundle 基本例句 维管束,输导束用于苔藓植物 The veins of leases are parallel, and the vascular bundles have bundle sheaths.平行脉序，维管束具有维管束鞘。 Moreover, the phenomenon that canaliculus bundle degenerate suddenly has been found in the experiment.此外还观察到维管束急剧退化现象。