| 单词 | 胚囊 |
| 释义 | DEFINITIVE EXAMPLES 权威例句〔emboly〕The formation of a gastrula from a blastula by invagination.内陷：囊胚翻转形成胚囊美国传统〔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〔embryonic membrane〕Any of the membranous structures closely associated with or surrounding a developing vertebrate embryo, including the amnion, chorion, allantois, and yolk sac.胚膜：任何与发育中的胚胎相关或包围胚胎的膜状结构，包括衣胞、绒膜胚囊、尿膜和卵黄囊美国传统〔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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