| 单词 | pollen grain |
| 释义 | DEFINITIVE EXAMPLES 权威例句〔generative cell〕A cell of the male gametophyte or pollen grain in seed plants that divides to give rise directly or indirectly to sperm.生殖细胞：雄性配子体的一个细胞或种子植物中的花粉颗粒，分裂后直接或间接地产生精子美国传统〔microfossil〕A microscopic fossil, as of a pollen grain or unicellular organism.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美国传统〔pollen tube〕The slender tube formed by the pollen grain that penetrates an ovule and releases the male gametes.花粉管：由穿透胚珠并释放出雄性配子的花粉粒形成的细管美国传统〔pollen〕The fine, powderlike material consisting of pollen grains that is produced by the anthers of seed plants.花粉：由种子植物的花药所产生的含有花粉粒的粉粒状的细致物质美国传统〔pollinium〕A mass of coherent pollen grains, found in the flowers of orchids and milkweeds.花粉块：由有粘性的花粉粒形成的块，常见于兰花和马利筋花中美国传统〔sporopollenin〕A polymer that constitutes the outer wall of spores and pollen grains.孢壁聚合物：形成孢子外壁和花粉物的聚合质美国传统〔tetrad〕Botany A group of four cells, as of spores or pollen grains formed by division of one mother cell.【植物学】 四分体：四个一组的来自母细胞分裂的细胞，如孢子或花粉粒美国传统 |
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