苏铁雄球果的结构与花粉的风传播相当一致，花粉云从一些较大的球果中释放出来。
The structure of cycads male cones is quite consistent with the wind dispersal of pollen, clouds of which are released from some of the larger cones.
异态不亲和系统涉及两种或三种不同类型的花，它们的花粉和柱头结构存在差异，通常是花柱和雄蕊的长度不同。
Heteromorphic systems involve two or three different forms of flower with differences in pollen and stigma structure and usually differences in style and stamen length.
结论：花粉有促进老年大鼠胸腺超微结构维持活力，有增强免疫和抗氧化功能从而能延缓衰老。
Conclusion: Pollen has the function of promoting the ultrastructure of senility rat to maintain activity, to enhance immune and antioxidant function which could postpone senility.
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