| 单词 | 胚珠 |
| 释义 | DEFINITIVE EXAMPLES 权威例句〔angiosperm〕A plant whose ovules are enclosed in an ovary; a flowering plant.被子植物：一种胚珠被包在子房里的植物；一种开花植物美国传统〔aril〕A fleshy, usually brightly colored cover of a seed, arising from the hilum or funiculus.假种皮：一种肉质的，通常色彩光亮的种子皮，由种脐或胚珠柄发育而来美国传统〔campylotropous〕Having an ovule partially inverted and curved such that the micropyle nearly meets the funiculus.弯生胚珠的：具有部分地反向生长并变弯曲以致卵孔几乎碰到珠柄的胚珠的美国传统〔carpel〕One of the structural units of a pistil, representing a modified, ovule-bearing leaf.心皮：雌蕊的结构单位之一，表示一片变异的、含胚珠的叶子美国传统〔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〔free central placentation〕The arrangement of ovules on a central column that is not connected to the ovary wall by partitions, as in the ovaries of the carnation and primrose.分离中央胎座式：（如在康乃馨和报春花的子房里的）胚珠长在不经深裂片与室壁相连的中央柱上的排列方式美国传统〔funiculus〕Botany A stalk connecting an ovule or a seed with the placenta.【植物学】 珠柄：与胚珠或含胎座的种子相接的叶柄美国传统〔hilum〕The scar on a seed, such as a bean, indicating the point of attachment to the funiculus.种脐：种子（如豆）上的疤痕，系胚珠于胚珠柄的痕迹美国传统〔integument〕Botany The envelope of an ovule.【植物学】 珠被：胚珠的外皮美国传统〔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〔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〔orthotropous〕Growing straight, so that the micropyle is at the end opposite the stalk. Used of an ovule.直生的：直立生长以至珠孔在茎的另一端的。用于形容胚珠美国传统〔ovary〕Botany The ovule-bearing lower part of a pistil that ripens into a fruit.【植物学】 子房：雌蕊中含有胚珠的较底的部分，成熟为果实美国传统〔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〔pistil〕The female, ovule-bearing organ of a flower, including the stigma, style, and ovary.雌蕊，雌蕊群：包括柱头、花柱和子房的花雌蕊，长有胚珠美国传统〔placenta〕Botany The part within the ovary of a flowering plant to which the ovules are attached.【植物学】 胎座：开花植物子房内的某部分，胚珠可附于其上美国传统〔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〔polyembryony〕Development of more than one embryo from a single egg or ovule.多胚；多胎：从一个单个的卵子或胚珠发展出一个以上的胚胎美国传统〔raphe〕Botany The portion of the funiculus that is united to the ovule wall, commonly visible as a line or ridge on the seed coat.【植物学】 脊，种脊：植物珠柄与胚珠壁连接的部分，通常表现为果实外壳上的一道条纹或突起美国传统〔seed〕A ripened plant ovule containing an embryo.种子：包含有胚的成熟的植物胚珠美国传统 |
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