常见例句Abnormal development was observed at tetrad and mature embryo sac.在四分躰和成熟胚囊時期觀察到了異常發育現象。The megaspore mother cell meiosis to form a linear megaspore tetrad.大孢子母細胞減數分裂産生直線形大孢子四分躰。 返回 half-tetrad