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.

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。

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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.

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。

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The Holocene stratum of Quzhou district is quite different from other areas of Hebei Plain in terms of the buried depth, thickness, depletion rate, color, grain size, structure and pollen assemblages.

河北平原南部曲周地区的全新世地层，在埋藏深度、地层厚度、堆积速率和颜色、粒度结构、孢粉含量与种属等方面，与河北平原其他地区不同。

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