| 单词 | 珠心 |
| 例句 | DEFINITIVE EXAMPLES 权威例句〔chalaza〕Botany The region of an ovule that is opposite the micropyle, where the integuments and nucellus are joined.【植物学】 合点：珠孔对面的胚珠内结合珠被和珠心的一个区域美国传统〔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 |
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