| 单词 | seed plant |
| 释义 | DEFINITIVE EXAMPLES 权威例句〔embryo sac〕The female gametophyte of a seed plant, within which the embryo develops.胚囊：种子植物的雌性配偶体，胚胎在其中发育美国传统〔eustele〕The central cylinder in which the primary vascular tissue is arranged around a pith, as in most seed plants.真中柱：一种管状中柱，其中初生脉管组织排列在髓孔周围，存在于大多数种子植物中美国传统〔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〔micropyle〕Botany A minute opening in the ovule of a seed plant through which the pollen tube usually enters.【植物学】 珠孔：种子植物胚珠上的小开口，通常花粉管由此进入胚珠美国传统〔ovule〕Botany A minute structure in seed plants, containing the embryo sac and surrounded by the nucellus, that develops into a seed after fertilization.【植物学】 胚珠：种子植物的一个小的结构，含有胚囊并被珠心所包围，施肥后长成种子美国传统〔pollen grain〕A microspore of seed plants, containing a male gametophyte.花粉粒：种子植物的花粉粒，含有一个雄性的配子体美国传统〔pollen mother cell〕The microspore mother cell of a seed plant.花粉母细胞：种子植物的花粉粒母细胞美国传统〔pollen sac〕The microsporangium of a seed plant in which pollen is produced.花粉囊：种子植物中产生花粉的小芽胞囊美国传统〔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〔threshing machine〕A farm machine used in threshing grain or seed plants.打谷机：用来打谷类或有籽植物的一种农用机器美国传统〔tracheophyte〕Any of various vascular plants, including seed plants and ferns, having a conducting system of xylem and phloem.导（维）管植物：任何种类的维管植物，包括种子植物和蕨类植物，具有木质部和韧皮部导管系统美国传统〔transition region〕A zone in a seed plant where the vascular tissue of the root changes into the vascular tissue of the stem.过渡地区：种子植物中的一个部位，其根部的维管束组织变成了茎部的维管束组织美国传统〔wanting〕Seed plants are totally wanting there.那儿完全没有种子植物。英汉大词典 |
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