| 释义 |
DEFINITIVE EXAMPLES 权威例句〔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〔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 |