以下为句子列表：
英文: A microscopic fossil, as of a pollen grain or unicellular organism.
中文: 微体化石一种微小的化石，如花粉粒或单细胞有机体的化石
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英文: In many gymnosperms the nuclei divide within the pollen grain to produce a small number of cells (2-40 depending on the group )representing the male prothallus.
中文: 在许多裸子植物中，细胞核在花粉粒中分裂以产生少量的细胞（2～40个，取决于不同种类），代表雄性原叶体。
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英文: It consists of an air-filled protuberance on each side of the pollen grain developed by the separation of the exine layers, giving the pollen a characteristic winged appearance.
中文: 它是花粉粒外壁向外扩展而形成的囊状结构，在花粉粒两侧呈翅状，其内充满空气。
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英文: It had snow-melting-like veins on the surface of pollen grain with several hollows.
中文: 萌发孔沟多为3对（顶分体3条，侧分体各对应1条），以四面体几何中轴为中心，中心对称分布于四面体的3个侧面。
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英文: Oleifera was observed with LM.Results showed that there were vegetative cell and generative cell in the pollen grain of Genus Camellia, the generative cell is more smaller than that of the vegetative cell.The generative cell was lay on the vegetative cell
中文: 结果表明，山茶属植物花粉粒中含有生殖细胞和营养细胞，生殖细胞较小，呈长纺锤形，游离在营养细胞中，生殖细胞极轴两端的细胞膜和核膜与营养细胞的细胞膜相连，其中一端的连结处位于花粉粒萌发孔附近。
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