花瓣维管束

petal bundle的用法和样例：

例句

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。

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