| 单词 | embryo sac |
| 例句 | DEFINITIVE EXAMPLES 权威例句〔nucellus〕The central portion of an ovule in which the embryo sac develops; the megasporangium.珠心：胚珠的中心，胚芽囊在此发育；大孢子囊美国传统〔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〔polar nucleus〕Either of two nuclei located centrally in a flowering plant embryo sac that eventually fuse to form the endosperm nucleus.极核：位于一株开花植物的胚囊中央的两个细胞核的任一个，这两个细胞核最终融合而形成内胚乳细胞核美国传统〔synergid〕One of two small cells lying near the egg in the mature embryo sac of a flowering plant.助细胞：位于开花植物成熟胚囊的卵细胞周围的两个小细胞之一美国传统 |
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